Something's amiss here
I'm not angry at you or anything, but there seems to be a problem with your physics engine. For some odd reason on the 48th level the nitro jars are not propelling the character properly, when he touches one he is not propelled into the opposite direction for some reason, but is instead held into place by some mysterious force, making it impossible to complete the level.
Additionally, I think you need to rethink the level design. Because I'm finding shortcuts through the levels without even attempting the puzzles behind it most of the time by just simply catapulting my character with a couple of blasts.