CONTEXT

Context & Goals

Started as an exploration of 'vibe coding' capabilities—using AI-assisted development to rapidly build complex systems—this project evolved into a fully-featured arcade-style space shooter. Built from scratch using vanilla JavaScript and HTML5 Canvas, the goal was to test how quickly I could create a polished, performant game while implementing professional software engineering practices including modular architecture, comprehensive testing, and proper separation of concerns.

The Problem

Professional Game Development

THE PROCESS

Design Process

Entity-Component-System architecture with test-driven development

Entity-Component-System Architecture

Modular System Design

Implemented ECS architecture with 5 core systems: Input System handles keyboard controls, Render System manages layered rendering with z-index, Physics System controls movement and velocity, Collision System uses spatial partitioning for performance, and Audio System generates procedural sound effects with Web Audio API. Each system operates independently, enabling easy maintenance and feature additions.

State Management

Built robust state machine managing game states (Menu, Play, Pause, GameOver) with proper transitions and event handling. Implemented event system for decoupled communication between components, reducing coupling and improving maintainability.

Performance Optimization

Achieved consistent 60 FPS through fixed timestep game loop with interpolation, spatial partitioning for collision detection, object pooling for entities, and efficient canvas rendering with layered z-index management.

Advanced Gameplay Mechanics

Weapon Progression System

Implemented 5 weapon types with distinct mechanics: Single shot (default), Triple shot pattern, Spread shot (5-bullet fan), Homing missiles (dual-tracking), and Area damage missiles with manual detonation. Power-ups provide temporary weapon upgrades with 10-second duration, creating tactical decision-making during gameplay.

Tactical Shield System

Designed shield mechanics with strategic trade-offs: 2-second active duration with 10-second cooldown, 50% movement speed reduction while active, 20% movement speed reduction during cooldown, and 30% slower fire rate during cooldown. These penalties create meaningful tactical decisions about shield usage timing.

Boss Battle System

Created epic boss encounters every 5 waves featuring multi-phase combat mechanics, health bars with phase indicators, unique attack patterns, and missile power-up drops upon defeat. Boss battles provide satisfying difficulty spikes and reward progression.

Comprehensive Testing

Test Coverage Strategy

Wrote 5,257 lines of test code across 15+ test files, covering unit tests for individual components, integration tests for system interactions, and end-to-end tests for gameplay scenarios. Achieved comprehensive coverage of game logic, physics calculations, collision detection, state management, and entity lifecycle.

Testing Infrastructure

Built testing infrastructure using Hapi/Lab framework with npm test runner, watch mode for continuous testing during development, ESLint for code quality enforcement, and automated test execution. This infrastructure ensures code quality and catches regressions early.

THE IMPACT

Impact & Results

Successfully built a production-quality browser game demonstrating professional software engineering practices including modular architecture, comprehensive testing, and performance optimization. The project showcases ability to design complex systems, implement advanced features, and maintain code quality through rigorous testing.

KEY LEARNINGS

Key Learnings