As Cities Skylines II still isn’t worth it (the sub has a regular thread about that, in summary: no it’s not: https://old.reddit.com/r/CitiesSkylines/comments/1ch6lup/is_cities_skylines_ii_worth_it_megathread/) which games scratch your city building itch?
I play a lot of random city builders and enjoyed most of what’s already listed by others here.
Haven’t seen these ones mentioned yet (I think), but you could check out these to see if any tickle your fancy:
Modern:
- Haven Dock
Prehistoric:
- Dawn of Man
Casual:
- ISLANDERS
- Microtown
Fantasy:
- Founders’ Fortune
- Airborne Kingdom
- The Wandering Village
- Fabledom
- Noble Fates
Medieval:
- dotAGE
- Foundation
- Going Medieval
- Farthest Frontier
- Kingdoms Reborn
- Settlement Survival
- Clanfolk
Sci-fi:
- Cliff Empire
- Space Haven
- IXION
- Stranded: Alien Dawn