Cool game, I liked the recurring mechanic of fliping the switching and doing the level backward. I had to give up non the 3rd level tho, the one with the rising lava, cause it was just... way to hard. Also I'm not sure if the key was necessary, maybe it's getting different in other levels, but in all the levels I played it was just right next to the door, so just leaving through the door would've been enough.
A bit too hard imo, but it was a cool game for sure.