The idea is cool. Took me a while to understand what was happening, but don't think that's a bad thing. The last level ended kind abruptly though, didn't feel like i had completed it's puzzle.
Would love to see a version of this that explored the mechanics a little further!
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Thank you deLima. I, in fact, was thinking in some other mechanics, like a teleporter, one way pass or a ball-only room, but I decided to keep it simple for my own sake!
And I think something was left to do (For example, find more balls to reach some trigger), because the final screen has a message on it. Or maybe a bug? I will take a look to see more about this, for sure