I really like the concept of switching between dimensions! It certainly adds a layer of depth to traditional block puzzles. Though, like many have already mentioned, the reversed controls are really annoying. The zooming transition between the two dimensions also felt a bit slow and nauseating, I think the transition should be sped up and be replaced with a fade effect. Also, it seems I can only carry one key at a time? When I was already carrying a key, I picked up another and then opened a door, only to find out that both my keys were consumed. Other than those things, I do like the concept here, some of the puzzles would only work with the added layer of dimension switching, so good job!
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Thanks for your feedback! We are planning on removing the reversed controls as soon as itch.io allows us to update the game. Like you and many others have pointed out, the controls really were only there to add more difficulty.
The carrying of keys is a little different then you described. Keys have specific doors they unlock, and their corresponding doors are opened immediately upon grabbing the key, so you don't actually carry any of them.