Very fun! The walking on walls worked surprisingly well, strafing up a wall just felt natural. All of the mechanics seemed pretty easily discoverable pretty quickly, which was nice. Sacrificing letters was fun, and then trying to figure out what the text says while remembering which letters I'd sacrificed was a feeling I don't think I've encountered in another game. I ran into one bug where I made my final step to get to 0 HP onto a mushroom and it only gave me the letter value instead of the 120 from the mushroom :(. That, and the getting stuck at the end ^_^. Other than that, it was pretty smooth sailing.