I'm looking for a new colony sim on PC. What I've played so far are:
Rimworld
Oxygen Not Included
Banished
Timberworld
Frostpunk
Anno 1800
I know some of these might not be strictly colony sims. What I'm really looking forward to is Manor Lords, but we don't have a definite release date on that.
It's still early access and is a little rough around the edges, but very playable and fun. Plus the devs are very responsive to feedback via their discord and have been making really good updates over the last year.