arowkeys or wasd (wasd was added later so it is not in the text on the screen and i used bitmap to vector so i cant change it) anyway avoid the white and go trough the levels. there is a bug that if you finish it and restart then the player wil go up and down then reset again for it to work.
the project from @SurvivorFan is the base i coded al the stuff around. if you want to make your own platformer but it is to hard for you then you can remix his project and code your own project around it :)