Neat idea requiring the player to have a certain number of boxes to destroy the platforms. I also like the twist of this mechanic being used against you, too, such as the part where if you had 9 or more boxes, you end up destroying some platforms you needed to progress.
I did struggle at the beginning part before you grab the third box. I couldn't reach the platform until I realized you can walk off ledges and jump in mid-air.
Nice job!