Thanks! ^_^
Airjumps (I don't want to say doublejumps cuz after 2 or 3 deaths you get an extra-jump) where one of the very first things I added to my game (at the same time I implemented normal jumping) so I completely forgot to add it to the instructions... whoops...
Luckily momopey wrote that he's stuck, thats where I remembered to add to the controls that you can infact do airjumps. next update I'll make it more clear (I had planned to add an "x airjumps left" counter but couldn't find a way to implement it in time) because that seems to currently be the biggest problem of my game.