Very cute and simple game.
The main thing that i have to say is that it needs better controls, you cant move in diagonals, it seems like there's a delay when you release the key and the character actually stops moving, also moving and shooting is impossible because the shots disappear for some reason, the character shoots with the mouse click but doesn't shoot in the direction, this is one is just a pet peeve of mine because i think that if you dont shoot in the mouse direction choose other way to shoot.
Music would be nice and some sfx as well.
The art is very cute, if you don't mind me asking what arts exactly did you make? Because almost everything that's in the game came from another asset, as you said on the "Used assets" screen.
Overall was nicely put together, needs some polish specially the movement and controls, but is a nice start and could be pretty fun with some fixes