Very cool game, as you probably already know by now with all of the positive comments. Really like the look of it and you got quite a big amount of levels for a game jam. It was a lot of fun to play through. The tutorial was very well done.
But somehow I managed to miss how I could throw people until level 15. I went back to see where the mechanic was introduced. Apparently in level 7. I managed to finish that level without throwing by jumping and switching to the person on top of the human tower while being in the air and quickly getting off. I used the same method in level 12 and really had the feeling it wasn't the intended way, but I didn't know what else to do. In level 15 finally, this method didn't work anymore because I couldn't get high enough so I went back to game page to look for the controls and that solved my problem.
I also found the jumping a little bit hard at times. The air control wasn't quite there and that made me miss a jump more often than I'd liked.
But overall great game that you can definitely be proud of :)