I got all the way onto the very middle island with the teleporter, and can go onto the last orange checkpoint, but I'm not sure what to do to make the game end. I have 3 moves after arriving at the teleporter island before it teleports me back down to the bottom right.
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You probably found an unintended way to get there, and by doing so bypassed all my softlock-prevention measures. Sorry about that! See if you can revert to the last checkpoint to renew the checkpoint's state. Kuchiwo Tsugumi has made a playthrough video in case you want to look up the intended solution.