The art of the helicopter is great. I wish you made the rest of the game look serious as well. Some things to improve would be:
- The picking up of the hearts (health) doesn't work. Do I need to press a button?
- The text of the signs is rendered in front of the character when you walk over it. This is because the canvas is set to a higher sorting layer than the character sprite.
- The gun is pretty useless.
- Platforms partially obstruct the character and enemies, making them hard to see.
- The character doesn't jump very well. It's almost like both legs are broken, but I guess that makes sence if you jump out of a helicopter without a parachute ;-).