I really liked the mechanic of putting input on a "conveyor" to plan a few steps ahead, I think I was going for something similar with my game :) I didn't love the idea of litterally losing controls, because you're getting to a point where you can't really do anything, so you're stuck waiting for the game over, unless I didn't understand something and you can recover from it...
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You can progress up until you lose the second to last move - then you're in a delayed game over state, you've already lost by that point and you are correct in that regard. You're in a terminal state where you have to move yourself into obstacles to end the suffering/game - otherwise it takes.... about 2 minutes? to end from timing out.