Hi! I was playing the game on normal mode as a Fuzzi and completed one planet, and I became an Ixi when I advanced to the second planet because I pressed Z instead of X to begin the second planet. I figured that this is a bug you'd like to hear about. I'm really enjoying this game, though!
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Ah! Nice catch! Uploaded a new version with a fix.
This was a stupid logic bug where if you pressed X AND Z at the same time, you could sneak into Hard Mode without having completed the game first (requirement for the mode). Also fixed it so you can't switch to Hard Mode between planets, only at game start. Had to find a few more pieces of unoptimized code in order to have enough tokens for the fix! :D