I really enjoyed playing it, it was fun! :) Though, I don't understand how to get ammo. There's a lot of confusing things in this game which you could have made some sort of tutorial level to teach the player how to play this game properly.
To get ammo, walk up to a shelf. The little transparent red area around the shelf should disappear, as well as the icon on the shelf. I will add a tutorial level if I make this a full game for platforms like steam. Thanks for the constructive criticism!