Pixel art looks nice! Very cute animations as well, I like it! A bug kinda impeded my progress as I was just stuck in a room without enemies spawning anymore. I walked around if there's any invisible enemies and if the portal was just hidden, but there was none. So I just had to restart game.
Other than that, gameplay feels good, nice attention to detail (bullet shells scattering) and it's great to be able to finish. It was "breathtaking!"