Runner v0.1

The controls are a bit loose when you land or jump while moving sideways. You'll accelerate too fast and fall. Also, there's no end to the second sky stage. You just reach the end and fall off. Hoping to see more levels when you update it.

I've deliberately left music out, so that if you play it in school you won't get caught.

Uh, nice, wanna more. Stucked on third, air level.

To answer stuff:
@Tigersight -- thanks for pointing out that the end block is missing. Coming next update! Also, I've made ground and air acceleration equal.
@39kk9t -- I'll add that next update. BTW, I decreased the acceleration speed after pressing up, so it's not that ludicrous anymore.
@dryflyriver -- hard? I tried to make the first few levels as easy as possible.
@Tigersight (other comment) -- the reason the trees spin round is this. When they are a certain distance away from the camera, they are rendered as 2D objects instead of 3D. When you get close, they become 3D. This is to make the game run faster.
@ Falopi --- that's kinda the point of them...

...Nobody knew that you can decelerate with the Down arrow after the instructions.