I like the idea but the playing experience was very frustrating.
I understand that you wanted the gravity to affect multiple objects at once but in the current state it just makes it so you unintentionnaly move the boxes when you want to move the platforms and vice versa.
The collision between the box and the player is a fun idea that could lead to crazy speedrun maneuvres but in the context of a casual playthrough it just makes it so you can't move the boxes from one side to the other in a "natural" way or you'll likely toss yourself across the level.
Sometimes I tried to drop a box somewhere and the box just snapped back with no reason to it.
Softlocking is already not the funniest experience, but when I do and I instinctively push the reset button only to be reset back to the tutorial I just literally wanna give up on the game at this point.
I might sound a bit harsh but I really think there's a good game in there but these points prevent it from getting there.