this is not a game. there are no instructions - which can be okay, so long as it starts out obvious on what to do.. but you did not do this. the buttons are also all in German, but this shows up in English results, which is NOT okay. I suggest you take this and fix the issues and either give direction, or bigger hints on what to do. because right now this is not a game, it is a mess.
the color is horrible. it is very difficult to see with those colors. look up color blindness and try to follow those rules, otherwise you take away a portion of potential players because they cannot read your title screen.
good game idea, but your controls are really slippery. I would make the beginning levels a little easier or the controls tighter. it is really easy to get frustrated. in the harder levels have some kind of check point so people don't rage-quit.
game controls are not intuitive, tried to jump on a ledge, was CLEARLY on the ledge, fell through. I understand the point of the game, but as a game designer you should never put out a game that is this buggy.