This
I liked how you could destroy the walls, that was a nice touch. I also liked how the game didn't take itself seriously at all. The only problem I had was that you should perhaps explain at the very beginning of the tutorial level that you can only shoot three times, but to be honest, even that isn't necessary because you don't have to shoot on that level and if you do what I did (fire three times immediately) you soon find out anyway. Good work