Various General Tips
As you're diving you'll see shining objects along the way and should try to collect them as they are needed to unlock new characters. 100 small boots will unlock a young boy Quin Quin, 200 robot legs will unlock Sad Robot, and 500 devil horns will unlock Satan!
In mid flight/fall use light taps to move left or right in order to be as precise as possible and land right on the spot.
Completing missions while you are running will earn you a point multiplier which means you'll get more points when doing a basic run.