its a pretty interesting concept and i really love the art style u chose its remind me of the old ps2 type games. the things that i want you to improve will be "optimization" its unplayable on the web. i know since it was a game jam and there were time limit, i found it interesting after i have know the mechanics of the game having a tutorial will improve the appeal.
Overall i liked your game you have done this in 20 hours is impressive to me i would not be able to create something like this in this much amount of time.