Creating a 2D game for Android: a complete guide from idea to publication

Creating your own 2D game for Android is an exciting process that can become both a hobby and a source of income. Even without programming experience, you can develop a simple game if you choose the right tools and follow proven steps. In this article, we'll cover the entire journey from ideation to game deployment, focusing on key aspects such as engine selection, level design, performance optimization, and monetization. Google Play, focusing on key aspects such as engine selection, level design, performance optimization, and monetization.

It's important to understand that game development isn't just about programming. It is important balance between game design, visual component and technical implementation. We will look at popular engines like Unity and Godot, as well as alternative solutions for those who prefer to write code from scratch on Java or Kotlin. We will pay special attention to the typical mistakes of beginners, which can spoil the impression of the game even at the testing stage.

If you have never been involved in development, do not worry - modern tools greatly simplify the process. For example, in Unity you can create a game prototype in a few hours using ready-made assets and visual programming. And for those who want to dive deeper, we'll look at how to work with Android Studio and native libraries for maximum performance.

1. Choosing a game engine: what is best for 2D games on Android?

The first and most important step is choosing an engine. It determines how quickly you can implement your idea and what opportunities you will have at your disposal. Today, three options are most popular:

• 🎮 Unity - a universal engine with a huge community and many plugins. Suitable for beginners thanks to the visual editor and C# as the main language.
• 🐍 Godot is a free and lightweight open source engine. Uses its own language GDScript (similar to Python), which makes it easy for beginners to enter.
• 📱 Android Studio + LibGDX is a solution for those who want to write in Java/Kotlin and have full control over the code. It requires knowledge, but provides maximum performance.

Which engine to choose? If you need Rapid development and are not afraid to pay for a license (free for small studios with income up to $100K), Unity is the best option. Suitable for open source software and a minimalistic approach Godot. And if you plan to develop complex games with unique physics or graphics, consider LibGDX or native development.

⚠️ Attention: If you choose Unity, please note that licensing conditions have changed since 2023. For projects with revenue above $200K per year, there is now an installation fee (Unity Runtime Fee). Check the current tariffs on the official website before starting development.

2. Forming an idea and prototyping a game

Before writing code, you need to clearly formulate what kind of game do you want to create. Start by answering the questions:

• 🎯 What genre? (Platformer, arcade, puzzle, strategy?)
• 🎨 What is the graphics style? (Pixel, vector, hand-drawn?)
• 🕹️ What mechanics will be unique?
• 📱 How will the player control the game (Taps, swipes, gyroscope?)

Do not try to immediately create complex project with an open world and hundreds of levels. Start with a minimal working prototype (MVP), which demonstrates the basic mechanics. For example, if it is a platformer, one level with character control and obstacles can be used for prototyping - the main thing is that the idea is clear.

Tools for prototyping:

• 📝 Figma or Adobe XD — for creating interface layouts.
• 🎨 Aseprite — for pixel graphics.
• 🎮 Unity/Godot — for quick gameplay testing.

3. Game design: graphics, sound and interface

Visual and sound components play a key role in the perception of the game. Even simple graphics can look professional if they are stylistically consistent. Here are the main elements that you should work on:

• 🖌️ Sprites and animations - characters, background objects, effects. For 2D games, they often use sprite sheets (a set of animation frames in one file).
• 🎵 Sounds and music - background music, sounds of actions (jump, collision). You can use free libraries like Freesound or OpenGameArt.
• 📱 UI/UX - menus, buttons, health/points indicators. The interface should be intuitive and not overload the screen.

If you are not an artist, do not despair! There are ready-made assets:

• 🎨 Kenney.nl —free sprites and sounds for games.
• 🎵 BFXR —a retro sound generator for games.
• 🖼️ Itch.io —a marketplace with free and paid assets.

⚠️ Attention: When using other people's assets, always check the license! Some packages require attribution (CC BY), others prohibit commercial use without payment. For example, assets with Kenney.nl can be used for free, but with a mention of the author.

For animations in 2D games skeletal animation are often used (for example, through Spine or DragonBones). This saves memory and makes complex movements easier to control. If your game is simple, regular sprite sheets will suffice.

4. Programming the basic mechanics of the game

Now we move on to the most technical stage - programming. It all depends on the selected engine, but the general principles are the same:

1. Create main game loop (input processing, state updating, rendering).
2. Implement character control (movement, jumping, interaction with objects).
3. Add physics (collisions, gravity). Unity i Godot have built-in physics engines.
4. Customize level system and progressions (saves, points, lives).

Example code for character movement in Unity (C#):

using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
public float moveSpeed = 5f;
public float jumpForce = 10f;
private Rigidbody2D rb;
private bool isGrounded;

void Start()
{
rb = GetComponent<Rigidbody2D>();
}

void Update()
{
float moveInput = Input.GetAxis("Horizontal");
rb.velocity = new Vector2(moveInput * moveSpeed, rb.velocity.y);

if (Input.GetButtonDown("Jump") && isGrounded)
{
rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
isGrounded = false;
}
}

void OnCollisionEnter2D(Collision2D collision)
{
if (collision.gameObject.CompareTag("Ground"))
{
isGrounded = true;
}
}
}

For Godot a similar code on GDScript will look like this:

extends KinematicBody2D

var move_speed = 300
var jump_force = 500
var gravity = 1000
var velocity = Vector2.ZERO

func _physics_process(delta):
velocity.y += gravity * delta

if Input.is_action_pressed("ui_right"):
velocity.x = move_speed
elif Input.is_action_pressed("ui_left"):
velocity.x = -move_speed
else:
velocity.x = 0

if Input.is_action_just_pressed("ui_up") and is_on_floor():
velocity.y = -jump_force

velocity = move_and_slide(velocity, Vector2.UP)

If you are developing on Android Studio s LibGDX, then the project structure will be more complicated, but you will get full control over performance. Example of game initialization:

public class MyGdxGame extends ApplicationAdapter {
private SpriteBatch batch;
private Texture img;

@Override
public void create() {
batch = new SpriteBatch();
img = new Texture("badlogic.jpg");
}

@Override
public void render() {
Gdx.gl.glClearColor(1, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
batch.begin();
batch.draw(img, 0, 0);
batch.end();
}
}

5. Testing and performance optimization

One ​​of the most common mistakes of beginners is ignoring testing on real devices. What works on a PC may slow down on a smartphone due to limited resources. Here's what to pay attention to:

• 📉 FPS (frames per second) - the game must produce at least 30 FPS on average devices. Use a profiler (Unity Profiler or Android Profiler).
• 🗑️ Memory consumption - some games drain the battery in 1-2 hours. Check the heating of the device. — A 2D game should not take up more than 100-150 MB of RAM. Optimize textures (use with compression or for Android). .png with compression or .etc2 for Android).
• 🔋 Battery consumption - some games drain the battery in 1-2 hours. Check the heating of the device.

Optimization tips:

• 🔄 Use object pool instead of constantly creating/destroying objects (for example, bullets or enemies).
• 🖼️ Reduce texture resolution for mobile devices (for example, from 1024x1024 to 512x512).
• 🎮 Disable unnecessary physics calculations for static objects.

⚠️ Attention: On devices with processor Mediatek or a small amount of RAM (2 GB or less), games on Unity may perform worse than on SnapdragonAlways test on several devices, including budget models like Redmi 9A or Samsung Galaxy A10.

For testing on real devices:

1. Connect your smartphone via USB and enable Debugging via USB in the developer settings.
2. B Unity select Build And Run with target Android.
3. B Android Studio click Run 'app' (green triangle).

6. Publishing a game on Google Play: from account to monetization

When the game is ready, it needs to be published. To do this, you will need a developer account Google Play Consolewhich costs $25 (one-time payment). The publication process includes several stages:

1. Preparation of materials:
   • 🖼️ Game icon (size 512x512).
   • 📸 Screenshots (minimum 2, preferably 4-6).
   • 🎥 Video preview (optional, but increases conversion).
   • 📝 Description in Russian and English (with keywords for ASO).
2. APK/AAB assembly:
   • B Unity: File → Build Settings → Android → Build (select .aab for Google Play).
   • In Android Studio: Build → Generate Signed Bundle / APK.

using GoogleMobileAds.Api;
using UnityEngine;

public class AdManager : MonoBehaviour
{
private BannerView bannerView;

void Start()
{
MobileAds.Initialize(initStatus => {});

this.RequestBanner();
}

private void RequestBanner()
{
string adUnitId = "ca-app-pub-3940256099942544/6300978111"; // Test ID

this.bannerView = new BannerView(adUnitId, AdSize.Banner, AdPosition.Bottom);

AdRequest request = new AdRequest.Builder().Build();
this.bannerView.LoadAd(request);
}
}