Nice game! I thought the pixel art was cool and gave the game an old school feel. I think the combat mechanics can definitely be polished and tweaked, but it's a good start! (I did run into a bug I should mention - the door opening sounds were repeating constantly throughout the game until I reached the boss level.)
I also would have liked to see a bit more of the story hinted in the game's description. What is described there sounds really great, so I would have liked to learn a bit more (maybe through a scene or two of dialogue before throwing the player into the action). Nice work though, and congrats on submitting to the jam!