What a cool idea! The art and the music matched together really well.
I also think that the difficulty scales a bit too fast, and I think that perhaps adding interactions with curses could help. Maybe something like “E and A will appear flipped when next to each-other” would help with the “all vowels look like E’s”? I dunno, I’m just making garbage up as I go along.
The point being, it was really fun, and I think it has a lot of potential if you were to decide to fully flesh it out!
Well done!