Ok, the game is great, good job. Here's my feedback:
- The shop screen is way too hidden
- Shooting at the chest to open them isn't very intuitive
- The Recoil seems to suggest that the weapon is powerful, but the sound, speed and the damage doesn't really respect that. Either reduce the recoil knockback or increase the damage and decrease the speed of the weapon
- The game doesn't pause when you're in the pause screen
- Give overall more feedback on the players action (when an enemy is hit, when you open a chest, when you take damage, etc.)
- You should add an indicator pointing where the exit is :3