Nice and fun wave-based survival. The different bullets was fun to use. I especially like the charged shot, as it felt really strong! The sprites are cute! If expanded, I can see it getting even more fun to play.
I think maybe decoupling the movement and the shooting would be better. It's difficult to run and shoot behind you. It works with the circular shot, but ones that require aiming it tends to be harder.
Otherwise, great work!