Thank you! I'm glad you liked the concept! The letter rotation was the first thing we came up with, and it turned out to work better than we expected.
I guess the game is a bit hard... balancing difficulty is something we always struggle with. I'm usually quite bad at games, so when I can beat them, I think they must be not that hard... but then, I made it, so it'd be quite sad if I couldn't beat it xD