Scramble is a side scrolling shooter. Thrust has a different sort of game play, with a lot more in common with Gravitar.
It's a physics game really, about velocity, mass and angular momentum
With pixel perfect collision detection.
And once you finish all 6 levels you get to play them again, with inverted gravity. And once you get used to that it reverses back but the walls are invisible. And then both inverted and invisible