What a neat little puzzler! You've managed to do a lot with only a few mechanics.
Bug detection squad report. I had to reset the game a few times.
- The first one I was victim of my morbid curiosity: I stood on a platform and froze the water under it.
- The second time I exited a room to reset it, ended up in a room where a conveyor belt was leading right into the exit I had returned through, and got stuck (the room where you put three blocks on conveyors right up to the exit, with the other conveyor going down the middle).
- The third time I was holding some movement keys when I walked into an exit and seemed to end up changing rooms diagonally, or at any rate ended up stuck in the wall in a room's corner.
- Then a fourth time I teleported into the right side of a room with two boxes and pushed them wrongly, without access to the room's exit (having gotten the item from the top dungeon, but not from the bottom one).