Downhill Chill is a downhill racer with contact: you're heading down a mountain against rivals, and shoving them off their line is as valid a tactic as taking a better one yourself. Flips off jumps add points and speed.
There are 200 levels and boss fights, plus upgrades between races, which gives it a lot more structure than the average browser racer.
Around 200, with boss fights punctuating the progression.
Flips and tricks off jumps, plus finishing position. Points feed the upgrades that make the later levels manageable.
Yes — swipe to steer. Nothing to install.