Final quality of life update

• Added SFX [no option to turn off though, sorry :c]
• Changed max ball speed: 8 -> 7
• Changed max spawn speed: 0.08 -> 0.11
• Changed auto tile remover timer: 8s -> 6s
• Added visual queues for when a tile is going to get auto removed
• Reduced shop price: 5000 -> 3500
  

This will be the real real last update, hope you enjoy the game!