Turbo/Glide is a car racing game with a car that is secretly also a glider plane.
The plane doesn't have any engine, so you have to build up kinetic energy in car mode.
[Up] - Throttle
[Down] - Brake
[Left] - Pitch plane left
[Right] - Pitch plane right
[C] - Turn car / flip plane
[X] - Shapeshift between car and plane mode
[R] - Restart level
Note that you don't use [Down] to steer up ;-)