Glad you had fun! Using the letters to input the thing to transform into was my initial concept. However, it does end up superfluous because there's so few items to choose. If there were more items to choose, then I think I could justify the mechanic. But as you said, if there's 3 choices, then why not use the arrows? I can totally understand someone pointing that out. I still like the idea, but it doesn't suit the scale I think. You're having a similar realization that I had with the RPS items. My first thought would be to do it your way, but ironically I decided that would be unintuitive! Maybe I should have wracked my brain a bit for a more creative category.
I'm happy you liked the art. It's something I enjoy and it's always satisfying to see it come out well. The audio isn't by me, but I spent like an hour trying to pick something lol.