This was so much fun! I liked the concept you've created of picking up you own bullets instead of having to find more ammo. The art style was very nice and the music fit very well to a game like this :D
I don't know if you've heard of Game Development World Championship before (gdwc2019) but it's a competition for indie game developers where they can submit their games and it's free! It's great if you want some more visibility for the game and it only takes a couple of minutes to join :)