Different focuses and objects of the game:
Fighting: Bounty hunter. Collect coal and water throughout the level while
tracking down the bad guy and defeating him. When you beat him, you take
his superior weapon and also get the bounty to buy and tack on an enhancement.
Pest control: basically the same but add some silly twists and goofy
insectoids.
Mining: Find deposits of resources (gold, oil, wood, etc), collect them
for your colony, increasing its wealth and your wealth, but increasing
population and need. Upgrades allow bigger harvest. Perhaps multiple bots?
Goal would be to have a large (perhaps targeted level) population.
Interplanetary Colonization: Similar to mining, but the goal would be to enter a hostile
environment with baddies and poor living conditions. Using it's tools and
weapons, the bot would clear out the hostile entities and create bubbles of
atmosphere where people could live. Once thriving, a colony would develope
higher levels of technology for the bot, then send it to another (more hostile)
planet to produce another colony. Players could choose which planet to colonize
next, picking between better begining atmosphere and resources but more enemies,
or few enemies but bad atmosphere and resources, thus influencing the choice of
upgrades and allowing for different stratagies.
Finding Utopia: I think this was the original concept--go from planet
to planet, upgrading your bot on each one and overcoming the obsticals until
you reach the ultimate planet.