Boss adjustments and bug fixes

GAME UPDATES:

Bug fixes:
Fixed SFX bugs
Fixed E-Bomb hitbox bug
Fixed Flying Chariot idle bug

Bosses Adjustments:
Communist Star: Added a new attack and made some tweaks
Christmas Tree: Made some tweaks
Detonator Gift: Made some tweaks

Weapons & Other Adjustments:
Backfire Snipegun: Decreased backfire damage
Added and removed some hints

New Feature:
Easy mode (Enable by hitting the gift behind the smoke when entering the main game)