Great concept for the main mechanic!
The music fits really well with the art and the gameplay, the jump sound seems to be a bit loud or harsh I guess which I think could be turned down.
In terms of the gameplay, the reset could be faster so as not to make the player wait if they died, I also wonder how the puzzles could be made different if while placing the platform the player could still move. Other than that I do agree that the scaling of the platforms seemed to be regularly most useful at its maximum size, with not many occasions where a smaller platform would prove more useful.
Neat execution of the game tho!! Best wishes with post-jam updates if you plan on it!