Post jam update: Music, Hi-Score & More!

Post jam update changes:

• Awesome background music by me.
• SFX volume tweaks for consistency.
• Particle and sound effect on squish.
• Camera shake on squish.
• Hi-score (best time) save system .
• Playdate system assets (card & icon).
  
• Useful in-game Playdate menu items:
  • Reset hi-score
  • Toggle music
  • Invert crank controls