Based on what I remember from my first completed game on Klik & Play back in the mid to late 90's. Multiple controls and rules for levels.
Collect money from your housemates to steal a spaceship to get back home to [not included] stop evil aliens from taking over. Eventually led to two completed sequels and one that was in the works. All of which have since been lost.

Level 1:
8-way movement = Move
Collect all coins to advance to next level.
Collision with enemies restarts entire level.

Level 2:
Platform movement = Move
Button 1 = Jump
Get to LEM to finish level.
Getting hit with asteroids restarts entire level.

Level 3:
Controls in-game
Button 1 = shoot
Shoot all asteroids to complete level.
Collision with asteroids restarts entire level.

Level 4:
Same as last level.
Get to Mars to finish level.