Space Shooter

A retro-style arcade space shooting game built with Flutter and Flame Engine.

Built with AI: This game was developed using self-evolving-agent's /evolve skill - an autonomous AI agent that learns and iterates until goals are achieved.

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Play Space Shooter

Screenshots

Features

Weapon System (5 Types × 4 Levels)

| Type | Color | Special Ability | |------|-------|-----------------| | Standard | Green | Balanced power | | Spread | Yellow-Green | Wide coverage | | Laser | Cyan | Piercing (hits multiple enemies) | | Missile | Orange | Homing (tracks enemies) | | Plasma | Purple | High damage |

Each weapon has 4 upgrade levels increasing bullet count and power.

Power-ups (12 Types)

Basic Power-ups (20% drop rate)

| Item | Color | Effect | |------|-------|--------| | Weapon Upgrade (W) | Orange | Level up current weapon | | Shield (S) | Blue | 8s protection | | Rapid Fire (R) | Purple | 5s double fire rate | | Speed Boost (>) | Yellow | 6s faster movement | | Bomb (B) | Red | Clear all enemies | | Extra Life (+) | Green | +1 life |

Weapon Type Power-ups

| Item | Color | Effect | |------|-------|--------| | Spread (SP) | Yellow-Green | Switch to spread weapon | | Laser (LA) | Cyan | Switch to laser weapon | | Missile (MI) | Deep Orange | Switch to missile weapon | | Plasma (PL) | Violet | Switch to plasma weapon |

Formation Bonus

| Item | Color | Effect | |------|-------|--------| | Mega Bonus (★) | Gold | +500 score + random power-up |

Enemy Types (8 Types)

| Type | Shape | Behavior | Spawn Direction | |------|-------|----------|-----------------| | Basic | Hexagon (Red) | Sine wave movement | Top | | Fast | Triangle (Orange) | High-speed straight | Top/Diagonal | | Tank | Square (Gray) | Slow but 3 HP | Top | | Shooter | Diamond (Purple) | Fires bullets | Top | | Zigzag | Star (Cyan) | Side-to-side movement | Top | | Tracker | Pentagon (Pink) | Follows player | Any direction | | Diver | Arrow (Yellow) | Dive attacks | Top | | Orbiter | Circle (Blue) | Orbital movement | Left/Right |

Spawn Directions: Top, Left, Right, Top-Left, Top-Right

Enemy Formations (5 Types)

• V-Shape: Classic formation
• Line: Horizontal row
• Circle: Circular pattern
• Arrow: Pointed formation
• Wave: Sine wave pattern

Formation Bonus: Destroy all enemies in a formation to get guaranteed bonus drops!

Boss Battles (Enhanced)

• Appears every 5 waves
• 3-Phase difficulty system:
  • Phase 1 (>70% HP): Basic patterns
  • Phase 2 (40-70% HP): More bullets, faster fire
  • Phase 3 (<40% HP): Enraged mode with spiral attacks
• Enraged Mode (<30% HP): Speed boost + aggressive patterns
• Health: 1.5-2x higher than before
• Drops 3 random power-ups on defeat

Controls

| Key | Action | |-----|--------| | ↑↓←→ / WASD | Move | | SPACE | Shoot | | ESC | Pause |

How This Game Was Built

This project demonstrates AI-assisted game development using the self-evolving-agent workflow:

Step 1: Create Domain Skill

First, a Flame Engine skill was created based on the Flame Engine documentation. This skill encapsulates:

• Flame architecture patterns (FlameGame, Components, World/Camera)
• Input handling (keyboard, touch, joystick)
• Collision detection system
• Sprite animation patterns
• Audio integration
• Common game patterns (object pooling, spawners, parallax)

Step 2: Evolve the Game

With the Flame skill in place, the /evolve command was used to iteratively build the game:

/evolve 建立一個太空射擊遊戲
/evolve 加入武器升級和道具掉落系統
/evolve 加入多種敵人類型和 Boss
/evolve 部署到 GitHub Pages

The self-evolving-agent autonomously:

• Searched memory for relevant patterns
• Applied Flame Engine best practices from the skill
• Implemented features with proper architecture
• Tested and fixed issues iteratively
• Deployed the final product

Development Time: ~40 minutes (initial) + ~20 minutes (enhancements)

Initial build (~40 minutes):

• Game architecture setup
• Player with 4-level weapon system
• 6 types of power-ups with drop system
• 5 enemy types with unique behaviors
• Boss battle system
• Wave progression
• HUD with lives display
• GitHub Pages deployment

Enhancement update (~20 minutes):

• 5 weapon types with unique properties
• 3 new enemy types with multi-directional spawning
• Enhanced Boss with 3-phase difficulty
• 12 power-up types
• Formation bonus system

Bug fixes (2026-01-13):

• Fixed Bomb power-up not clearing enemies (recursive search for nested components)
• Added visual confirmation flash effect when Bomb triggers

Why This Approach?

| Traditional | AI-Assisted | |-------------|-------------| | Read docs → Write code → Debug | Skill captures expertise → AI applies patterns | | Manual iteration | Autonomous PDCA cycles | | Knowledge in developer's head | Knowledge encoded in reusable skills | | Hours to days | ~40 minutes |

Skills are "packaged judgment" - they tell AI when to use what patterns, reducing decision points and ensuring consistency.

Tech Stack

• Flutter 3.x
• Flame Engine 1.x
• Dart 3.x
• AI Agent: self-evolving-agent

Development

# Install dependencies
flutter pub get

# Run in development
flutter run -d chrome

# Build for production
flutter build web --release

Deployment

The game is deployed to GitHub Pages using the gh-pages branch.

# Build and deploy
flutter build web --release
# Copy build/web/* to gh-pages branch

License

MIT License

Credits

• Built with Flame Engine - A minimalist 2D game engine for Flutter
• Developed using self-evolving-agent - An autonomous AI development workflow