One of the most important things in a platformer is that the player knows exactly where they are going, and I don't know which level it is, but one of them had something called a "blind jump" where the player couldn't possibly know where to go the first time they play the game.
Is there ground beneath them against the wall? A small target to land on? Perhaps it's all death. The player has no Idea, and to make matters worse, the solution involved using two powerups to travel the maximum distance or else you die. You never want the players to be lacking information, and teaching through death is something to stay away from.
I thought the final boss was a lot of fun! There are definitely some cool mechanics in this game. It's a shame there's no music / sound effects, though that's understandable with the 48 hour time limit. Overall it's pretty solid, just with a blind jump that needs fixed. Nice game!