This is a really cool idea for a game, but it's clearly complex! If you expand the game I think a proper in game tutorial would be a really good idea, but I obviously know you were on a time crunch! I didn't realize I had to click the door to get my weapons so I was confused why I couldn't do anything with the attack option, and once I got a good sword in there it took care of the enemies for me. I'd love to see this built upon more!
Congratulations on finishing your first game! GMTKjam is a great event to have chosen for it! I look forward to seeing more from you!