Good job on your first jam!
Overall good world design. I liked the parallax effect as well as the atmosphere.
Unfortunately the sound didn't fit the dungeon. It is more of a forest at night sound, while the game takes place in a dungeon. When I heard the howling I expected some dog enemy charging at me, but that never happened. I only realized later that that was just ambient sound.
Look up some drone sound effects or make your own. You can create a creepy track by slapping random things in your room while breathing into the microphone. Reverse track, change pitch and you're done.
Level 4 broke for me (arrows get stuck in the air when firing). In some levels the mages where placed rather unforgiving. I feel like some additional hit points wouldn't hurt ether.