Wow this is an amazing concept and an amazing looking game! Wouldn't be surprised if this has a solid chance of making it to the top 100 games! Gameplay itself is so unique that it would serve as a good theme for a full game I would think. Very good idea.
A couple minor critiques:
1. The level with the three enemies in a row coming right for you, I'm not sure if it was glitched, but the QWEASD keys disappeared that show you what keys to try. I then couldn't figure out what to do, it said I could select the little thing on the floor but pressing all the keys did nothing.
2. I might just be slow at these types of games, but everything seemed a bit fast. Like it usually took me a few deaths a level to even have an idea what to do. I wonder if maybe having the game pause initially so you can get a lay of the land first, then press a key when you are ready for it to begin. Also maybe slowing down the item selection even more might help too.
Other than the above though I think this is a fantastic game and a great entry into the jam! Amazing work here!!