Tech used includes: Audio API Integration, CSS Animation, Custom React Hooks, Game State Management, HTML5 Canvas, Keyboard Event Handling, Performance Optimization, Pixel Art Design, React.js, Responsive Web Design, Web Audio API, CSS Variables, Flexbox Layout, Media Queries, CSS Pseudo-elements, requestAnimationFrame for smooth animations, Collision Detection (AABB), Dynamic Difficulty Scaling, Asset Preloading, Touch Event Handling, CSS Box-shadow for visual effects, Base64 Encoded Images, ES6+ JavaScript Features, Asynchronous JavaScript (Promises, async/await), React useEffect, useState, useRef, and useCallback Hooks, CSS Clamp() function for responsive typography, Event Bubbling Prevention, and Accessibility Considerations (ARIA labels).