Hey! Nice effort here! I see the inspiration from Binding of Isaac a game i really love!
I ll start with the music which was really nice and while the track is short it never felt repetitive. Awesome job on that! The graphics are solid for a game like that. You have a good base on those two. What felt a bit off is not having 8-directional movement and i also feel that the character should rotate to where the mouse is pointing at. Those games are designed with fast movement / shooting in mind so i feel these two will be nice improvements.
Solid effort! Keep it up!