In the first room you couldn't enter two base plates in the north. In the second room you could stand on the door and block it from going up again. If you spamming up/down to a trigger many times you could exploid the game without thinking. You could easly get through the levels. And I wasn't sure how the recoloring of pattern works. I believe thats not quite right, but I'm not sure on that on.
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The plates in the first room...you are right, it was a problem I had just a few minutes before submission and couldn't figure out why hah. The other things are actually not exploits! Standing on barriers keep them down until you are away from them. Some of these early levels have multiple ways of solving them, and players can choose to keep pressing a button down, if they figure that out.