Plot suggestions for a space-themed tycoon game

Yes, i want to insert a plot into the “tap a button and wait to tap more buttons” game about travelling in space… I am planning to set up story events on a certain periods of game/certain planets/ unique interactions. any ideas are welcomed, from aliens watching to violent galactic warfare or even cube cat invasion(maybe)

Looking at your other posts indicating it’s static-location based with each “world” being a planet, it could be that you get chased by proxies and minions of very hands-off alien “investors” who are angry about their mineral rights or whatnot.
Or, of course, any alien wildlife you’re able to animate that wants to eat you (or can sniff out extra rare rewards if you leave them alone, like how people use pigs to find truffles in the ground)