I was thinking about a a few mini games like 'protect your colony'
Where you protect your planet form incoming invaders
As you control a 360 degrees turret
Survive waves of enemy ships
Get minerals (And sometimes special minerals) for every round you survive (Small amounts increases as you progress)
Bosses appear every 5 waves when you defeat a boss you grain a save point so you can continue later
Survive 1000 waves to receive a special molecule
Survive 5000 waves to receive a upgraded version of the molecule that replaces the old version
Survive 10000 waves to receive a new ship ally

This sounds like a completely new game within this one. Most of those styles of games are standalone in their own right, and would not be properly supported by the current game platform.