Nice.
I'm not entirely sold on the prop blocks, since it can result in Bob falling behind a bit. My over-reliance on them ended up causing my downfall.
Juggling blocks forwards is a pretty fun way to have enough blocks to move forwards. An animation/particle effect for the TNT would be good. I didn't put enough effort towards moving TNT outta the way, so I had to rely on the prop blocks I had retained.
Fun game. The little indicators for unstable platforms is really quite useful, and really helps out with gameplay.