Thanks! Yeah, there are 15 levels (excluding the "title screen" and "end screen" levels), but I don't expect people to finish all of them, the later ones are pretty difficult and there are many other games to play in the jam. The pushable boxes in level 8 (or 9 if you count the first screen) are the last major mechanic in the game, everything from then on combines mechanics and the levels get much more involved. So around there is where I would honestly expect people to stop.