Incredibly creative mechanic. Superbly executed, fluid and intuitive. Though i think freezing the player in place while masking would have been a good idea for ease of play and accessibility. Other than that tiny criticism, this is impressive.
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Thank you! I hadn't thought of doing that, that could be helpful, though it would have also forced us to leave out our favorite hidden trick:
Spoiler warning!
If you stand in an area you're masking out and start rematerializing the tiles starting at your feet, you can climb up a tall tower very quickly.