Game reminds me of QWOP and Mount your Friends.
Had the same issue at other players, not all keyboards can register all keypresses at the same time. I had to try and see what keys could be registered at the same time.
Did manage to beat the first level though ! (Which remimds me: You might want to do your game in English as I had no idea what the buttons after level 1 were saying ;P)
Great job !