Really nice one. It's a lot of fun to play, and the art and sound are great. It was also fun discovering the different behaviour of holding down the LMB vs quickly pressing it.
I just didn't understand what the UI meant, like where I could find my health. The dash after firing was nice as well, but I wish it could be used to damage the enemies as well. I also constantly confused the small enemies with projectiles. So, I would remove them from the game.