I feel like this is a really neat idea held back by a couple of things.
The terrain doesn't really seem to generate in a way conducive to the game's progression. There were a few times that a green square was in a little room on its own that was totally unreachable as far as I could tell.
I think as well that by the time you can see the purple and which direction it's moving, it's often impossible to navigate the maze in a way that lets you avoid it.
The Out of Control mechanic itself was AWESOME. I really liked the exact amount of control you had over your character and feeling the heartbeat speed up was super cool. Maybe a neat idea would be if when you grabbed a green square it actually deflected the purple back in the opposite direction, so you could riskily grab a green just in time to save you from the purple that's about to overcome it?