Games like Ascent of Ashes
Games like Ascent of Ashes include RimWorld, Oxygen Not Included, Dwarf Fortress, Manor Lords, and Frostpunk. We matched them by the tags players give Ascent of Ashes on Steam (Strategy, Colony Sim, Base Building, Survival, and Real Time Tactics): closest matches first, and among equally close ones the better-known games.

RimWorld
Shared: Colony Sim · Base Building · Strategy

Oxygen Not Included
Shared: Colony Sim · Base Building · Survival

Dwarf Fortress
Shared: Colony Sim · Base Building · Strategy

Manor Lords
Shared: Strategy · Base Building · Simulation

Frostpunk
Shared: Strategy · Survival · Colony Sim

Prison Architect
Shared: Base Building · Colony Sim · Strategy

Kingdoms and Castles
Shared: Colony Sim · Strategy · Management

Kenshi
Shared: Survival · Immersive Sim · Simulation

Against the Storm
Shared: Strategy · Base Building · Simulation

Space Haven
Shared: Colony Sim · Base Building · Strategy

Settlement Survival
Shared: Colony Sim · Survival · Strategy

Going Medieval
Shared: Colony Sim · Strategy · Base Building

Empires of the Undergrowth
Shared: Strategy · Base Building · Colony Sim

Banished
Shared: Colony Sim · Strategy · Survival

Infection Free Zone
Shared: Base Building · Strategy · Survival

Colony Survival
Shared: Colony Sim · Base Building · Survival

Workers & Resources: Soviet Republic
Shared: Strategy · Base Building · Simulation

Timberborn
Shared: Colony Sim · City Builder · Base Building

Endzone - A World Apart
Shared: Strategy · Survival · Base Building

Stonehearth
Shared: Colony Sim · Strategy · Survival

Ostriv
Shared: Strategy · Colony Sim · Base Building

Factorio
Shared: Base Building · Strategy · Survival

Norland
Shared: Strategy · Base Building · Colony Sim

They Are Billions
Shared: Colony Sim · Strategy · Base Building