The listing, Krautscape [Steam Key] has ended.
Krautscape is an action-packed racing game with bird-like flying cars and procedurally built racetracks. The leading player builds the racetrack while the chasing players can take shortcuts by flying off the track to overcome obstacles. But the track is needed to score and to get speed – the vehicles don't have any thrusters to accelerate while flying.
Krautscape features three unique multiplayer gamemodes that are designed to support nonlinear gameplay and intelligent movement instead of forcing you to drive perfectly. Three singleplayer game modes introduce you to the basic mechanics of driving, flying and track building.
More info: http://store.steampowered.com/app/268360/
------------------------------------------
This game works on mac and linux too!
Good Luck!