So, I played this game, but couldn't really get the controls to work, no matter what I did, it didn't affect the runner. Or maybe, that's how it's supposed to be, the character runs himself, you're only allowed to change his stats?
Anyway, a couple of things I noticed:
1)Stamina doesn't seem to be affecting anything. You can make it negative, but the runner will still run, you can make it over 9000, but the runner can still eventually run out of it and get exhausted. Other than that I think I managed to figure out, what stats do.
2)Exhausted runners cannot reach the goal, even if they keep sliding, they get stuck right in front of it.
3)There are problems with collision detection, if the runners are fast, they often clip into walls, when they're exhausted, they keep sliding left and right on the surface of the level, when they're climbing they keep switching between falling and climbing state.
4)It's entirely possible to fly above the goal and miss it, don't know if it's a feature.
I think it would be more fun if there was a way to affect the race while it's still going, instead of being a passive observer, if the stats were limited by a certain amount of points, so that you'd have to compromise, and if you had a preview of the level, so that you could figure out, which stat configuration is better for which one.