Simple but fun game. an idea that i had to make the game a litle more intrestingis to have a 1 in 2 chance of ammo drops, and have the ammo not despawn so there is an aspect of ammo management.
I had tried leaving the ammo but after a few stages its like a gold mine, but I definitely think there are a few more things I'd like to do in the future with the ammo management to make it more fun :)