I want to do a campaign centered around humanity's invasion

Fiasco

>>55388744
Dungeons and dragons 4e

>>55388744
Stars Without Number, it can do the military stuff but also politics, trading, espionage, etc.

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>but not a military game

Reality will force it into being one. 40K.

>>55388744
just refluff pathfinder ;)

WaRP

>>55389122
Expanding on this one, bits you'll want to use (or just steal for use somewhere else)

>agency rules, Darkness Visible
For playing a bunch of government or NGO spooks and quickly resolving the things agencies do to each other.
>army/mercenary rules, Starvation Cheap
Like the agencies, but for sending people to their death.
>colony rules, Suns of Gold
Maybe, mostly deals with the economic side of setting up a colony that is usually handwaved.

You can use them in the background to generate events for your players to deal with, or hand control of a faction to the players for their downtime.

>>55389221
lol, why waste your time? just go with starfinder, just ignore all the tactical minis 4.5e bullshit.

>>55388744
Is that Ronnie James Die?

>>55389344
dI0

Just refluff Mouse Guard

Fate.

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>>55388744

>>55388744
Burning wheel, there's an alternate setting called 'burning empires' which a scifi version of the system.

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>>55389356