I like how there's a lot more to discover for multiple playthroughs, the visuals are solid and the music is great, did you make the song?
I felt although the monster sprites were great but their movement patterns were pretty much the same. The game in the end was really a fetch quest for keys to unlocking the door, there's no incentive for killing the monsters and they constantly spawn. I thought it was great that the monsters were able to travel to different rooms, however because of the way the camera jumps to the next room, it's not possible to predict where they are.
I think this game is solid and the polish is already there but I feel this has alot more potential, I think rewarding the player through gameplay and quality of life features can make it great all round.