Hi! Great job — the moving platform mechanic is really interesting.
Just a few bits of feedback:
Some levels can be completed without even moving the boxes. If — as I understand — your goal was to make box-moving the core mechanic, you should fix that.
At the beginning, it wasn’t clear which boxes I could or should move (maybe outline them, or include a short tutorial to explain it).
Finally, I would’ve liked some kind of limitation when moving boxes. Right now, it feels more like a god-like power than a puzzle-solving mechanic.

That said, it’s a really cool idea overall — keep it up!