Up to jump. Arrows to move side to side.
I played this all the way back in 2009. I occasionally go back and play some of the games I really enjoyed from that era, but this one is currently broken. This is due to changes in the scratch 3.0 color detection system. long story short, this was an easy thing to fix. just go in to the code and update the colors so they aren't broken anymore. and bam! Tanner's game is playable once more! Enjoy!