Plinbo v1.2.1 - Minor Fixes and Balance Update

Plinbo: Roguelike Plinko

Hey everyone! This update focuses on improving early game balance, refining Physics Mode, and making sure new content is fully available across modes. Thanks a lot for all your feedback, it really helps us shape the game! Balance Changes Coffin card cost reduced by 1 at all levels Letter card cost reduced by 1 at all levels Level 1 difficulty slightly reduced for a smoother start Physics Mode Improvements Incre