Press the green flag twice to get it to work. Use the arrow keys to go towards the different levels. Within levels use the arrow keys to jumps from platforms. Up to go into levels when standing in front of the tunnels Achievements are there too
Report any problems with the game to me but remember this is only a beta test. Update 12/9/14: I fixed the problem with the level running after you've finished it so there are no more problems with that.