Ok, so my players absolutely loved this module. I think maybe I went a bit easy on them in terms of how aggressive the cubes were, but they were having so much fun trying to understand the situation that I didn't want to interrupt it with a lot of combat. A+, would happily run again (if I could find a new batch of players, or somehow wipe the memory of my existing players).
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If I ran it again, I'd probably try to drop more clues about what some of the devices do, instead of just saying "nothing appears to happen when you press that button". Spoilers: For the Swapper room, I told them that they started drifting slightly towards the gap between the blocks after pressing the button. The idea being that the swapper moved that chunk of atmosphere outside and replaced it with vacuum.