I think the problem IMO is that there needs to be some kind of issue or dilemma the player faces, even if it's incredibly easy, in order for it to really be a puzzle. There were certainly moments where I wasn't sure what I was doing, but usually by the time I'd got my bearings it was already over. Again, I think if button/door relation was clearly conveyed then I'd at least be able to think things through. I'm sure even an easy puzzle would feel better if I feel like my choices solved it rather than hitting buttons until it solves itself.