Can't Stop, Must Survive (Godot 4.1.1, DAY 3)

This game is made for the (DAY 3 - Pass the GAME Challenge 2023)

Day 1: https://ghost-wave.itch.io/space-flight-godot-4
Day 2: https://made-by-gare.itch.io/cant-stop-must-survive

Changelog:
- Improved enemy pathfinding
- Improved smoke particles
- Changed player looks a bit
- Changed enemy looks
- Changed bullet color
- Added health system
- Added gameover screen
- Added enemy kill counter
- The music is quieter by default
- More enemy will keep spawning
- Player now boosts faster
- Enemy now moves faster
- Fixed some bugs