Add vertical movement controls (W/S keys), thruster effects with particle trails, dynamic background scrolling speed based on player position, and improved wave system with configurable waves
This commit introduces several key gameplay enhancements:
- Implemented W/S keyboard controls for vertical movement with boundary limits
- Added thruster visual effects with flickering animation and sound when moving upward
- Created particle trail effects that follow the player during thrust
- Implemented dynamic background scrolling speed that increases as player moves upward
- Enhanced wave system with configurable wave settings for easier management and extension
- Updated menu controls display to reflect new W/A/S/D movement scheme
The changes improve player mobility, visual feedback, and game progression system while maintaining existing functionality.
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