When you overlook the crude graphics; when you overlook that this game is for the unexpanded Vic; when you overlook the fact that it has about as much to do with cosmonauts as black bread has to do with pretzels; then Cosmonaut isn't a bad game.
It's your basic running, jumping, standing still game. To free your trapped spacecraft you must descend through several stormtrooper-infested levels, and find the off switch for the tractor beam.
Lifts connect the levels. The stormtroopers shoot to kill.