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just did. but in the last room after i resetted a few times it would not let me pick up the block. It seemed to get swaped with the future block and then lost collision.  In the 3. level it's btw possible to throw the block out of bounce when you are to close to the wall

I ran into the same bug. Also, watched the walkthrough, and the solution to that level is exactly what I thought it was, but I can't perform it. For me the wall always just clips through me so I get stuck halfway up.

So I'm going to second the "good idea" opinion of Waffelnsalat - I've seen time travel mechanics in puzzle games, and there's always some potential there. But there's definitely some bugs.