Games like Reignfall
Games like Reignfall include Banished, Hotline Miami, They Are Billions, Chivalry: Medieval Warfare, and Hotline Miami 2: Wrong Number. We matched them by the tags players give Reignfall on Steam (Colony Sim, Action, Strategy, City Builder, and Gore): closest matches first, and among equally close ones the better-known games.

Banished
Shared: Colony Sim · City Builder · Strategy

Hotline Miami
Shared: Action · Violent · Indie

They Are Billions
Shared: Colony Sim · Strategy · City Builder

Chivalry: Medieval Warfare
Shared: Action · Gore · Violent

Hotline Miami 2: Wrong Number
Shared: Action · Gore · Violent

Devil May Cry 5
Shared: Action · Hack and Slash · Third Person

Kingdoms and Castles
Shared: Colony Sim · City Builder · Strategy

Dawn of Man
Shared: Colony Sim · City Builder · Strategy

Party Hard
Shared: Strategy · Action · Violent

Brutal Legend
Shared: Action · RTS · Hack and Slash

Frostpunk
Shared: City Builder · Strategy · Colony Sim

Infection Free Zone
Shared: City Builder · Strategy · Colony Sim

Middle-earth: Shadow of War
Shared: Action · Violent · Gore

Going Medieval
Shared: Colony Sim · Strategy · City Builder

NINJA GAIDEN 4
Shared: Action · Gore · Hack and Slash

My Friend Pedro
Shared: Action · Gore · Indie

DOOM Eternal
Shared: Action · Gore · Violent

Sifu
Shared: Action · Gore · Third Person

RUINER
Shared: Action · Violent · Gore

Warhammer 40,000: Dawn of War III
Shared: Strategy · Action · RTS

Farthest Frontier
Shared: Strategy · City Builder · Colony Sim

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Indie · Action

Paint the Town Red
Shared: Action · Gore · Violent

Dead by Daylight
Shared: Gore · Violent · Action