In Gravitor, you control a small spaceship which must be guided from its home base to one of four satellite systems. Here it must collect fuel from four dumps before entering the third stage where more fuel must be stolen. During your mission you are fired at from enemy bunkers and must avoid guarding UFO. However, gravity is probably the major problem since you are continually falling back to the planet surface.
Control is provided by forward thrust and clockwise or anticlockwise rotation. The secret revolves round how well you can control your spacecraft. I think this is more for the experienced player, as novices could become very frustrated.
The graphics are simple but clear, which is probably best since it is important not to let your concentration wander too far. Sound effects are good and probably help in controlling your ship. As you progress, a further hazard is that you have a limited amount of fuel.
If you have tried Super Meteors or similar games, then Gravitor is best described as the graduates' game. A challenge for those brave enough to accept it.