Very fun game ! The limitation is... well *reading the game description*, respected.
The game idea was cool, the level design is good and the graphics are clean (for a game jam game, that's a compliment).
I just found it was hard to know where you can spend a jump and where you shouldn't (I finished the last level with 3 extra jump). Maybe, if you want to upgrade it, you should do screen sized levels, with for each a number of jumps defined