This was really really fun! :D A very fresh mechanic. Almost like some sort of puzzel/adventure thing. I think I would've loved some more in-game explanation of some sort what all the spells did, at the moment it was a lot of scrolling between the game and the description. I think a very nice addition here would be to perhaps add more spells as levels increased and each time you picked up a new one, you'd get some sort of description.
All in all, the fact that you could push so many spells and content in "just a jam game" is really admirable! :D
Well done!