Great gob! This turtles are so hard to kill :D
Overall I didn't catch any bugs but I have some wishes for your game.
1. Sounds in your game and some background music.
2. Maybe healthbar for enemies.
3. More varity of enemies in future.
4. I didn't understand how is reload works. Wish some animation or sound design for it.
Good start for a good game! Hope you will try our game too. Wish you all the best in your development!