I love games like this, where you have time to think, but not too much time. I didn't realize that the things on the left were powers until I made it to the end. I know the controls were in the description, but maybe some short tutorial area that requires the use of each once before the boss shows up? If you decide to continue working on it, which I think you should, it is a great idea! Well done!
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A tutorial was definitely on our list, unfortunately we ran out of time and had to cut a few features :(
I admit we should have at the very list added the keys to the UI to make things easier. I'm glad you liked it either way and know that we'll definitely update it for polish and bugfixes after the jam ends, if not making it into a full game ;)