An interesting and unique concept, with a few small problems.
The art is very nice, and and it was fun to try out the weapons and work out how the different bosses acted. There is nothing in the UI to indicate which weapon is equipped so it was hard to keep track, and as others have said the lack of visual and audio feedback upon dealing and taking damage meant I was unsure of whether some of my attacks were hitting, and I died unexpectedly a couple of times. However, I did beat the game, and then replayed a couple times to test the weapons, which are all very unique, and I understand the absence of some features as I had to cut a few things in my game as well due to the Jam time limit.
Overall, with the addition of some more UI and damage feedback, this could be an even better game.