I usually try to find something negative, but nothing stood out to me here.
The only real criticism might be that it doesn't explain exactly how it works—it took me a few minutes to figure it out. Even though it's demonstrated at the start, it didn't click for me right away. ^^
But once it did click, my competitive spirit really kicked in.
I struggled a bit at first—since I hadn't fully grasped the mechanics yet—BUT there was a "rewind" feature (using the Z "Y" key) that let you undo moves; I think that was a really important and smart decision.
Then, just like in the description (which I only read *after* playing), I had a bit of an "aha!" moment at Block 2. ;)
I found the sound, animations, and music all pleasant, and the very last "level"—serving as the finale—was really cool. ^^
Really Nice Game !