This is pretty fun, but is held back by the visuals in my opinion. Aiming for clarity above anything I think will help out a ton

Runs rather slow but I found the art rather charming and the concept interesting

lots of potential here. I enjoyed the game. I do agree with Falhops with working with the graphics a bit more so you can see everything! Good job

A+ for effort! Perhaps make a cleaner background and larger enemies so you can see all the nice graphics?
There's not really any incentive to change weapons. Perhaps make enemies that only dies to certain weapons?