Ok, now that I'm here in the comments, I see that the cube needed to be spinning in order to open certain doors. Is that the purpose of velocity swap? I was confused at that part in the tutorial. Overall, I think the game is very clean, good puzzler.
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yes. That is the main purpose of velocity swap, (I need to work on the tutorial) but you can use it for other things as well:
(e.g. If you time freeze an object while it is moving fast, then you velocity swap, it will give you the speed the object had, but in the direction the camera is facing.)
If you have any ideas of how to teach that, in game without making someone read all that, I will happily accept them. 👍