Suggestion (in game events)

[Jappe]

You could make in game events to harder asteroids or you could turn them on/off in the game setting while choosing the asteroid. For example germ outbreak (causes germs to replicate and spread faster for a limited time) or crash (something crashed to the asteroid and caused the asteroid's core to crack and spread some heat to the asteroid). the events don't have to be so hard and there could be positive ones too for example strange enzyme (an strange enzyme has dropped in the clean water and causing half of the food poisoning germs in the water to die). If you think this is an good idea you can alter it.

[Tayphil]

Sort of like in Rimworld. I like it.

I suggest a Morb Invasion Event through toilets/sinks/showers.