Games like Y2K Directive
Games like Y2K Directive include Noita, Stoneshard, FTL: Faster Than Light, Stellaris, and Europa Universalis IV. We matched them by the tags players give Y2K Directive on Steam (4X, Wargame, Sandbox, Difficult, and RTS): closest matches first, and among equally close ones the better-known games.

Noita
Shared: Difficult · Sandbox · Roguelike

Stoneshard
Shared: Roguelike · Strategy · Pixel Graphics

FTL: Faster Than Light
Shared: Roguelike · Strategy · Difficult

Stellaris
Shared: 4X · Strategy · Sandbox

Europa Universalis IV
Shared: 4X · Strategy · Wargame

RimWorld
Shared: Sandbox · Strategy · Survival

Terraria
Shared: Sandbox · 2D · Pixel Graphics

The Binding of Isaac: Rebirth
Shared: Difficult · Roguelike · Pixel Graphics

The Escapists
Shared: Strategy · Pixel Graphics · 2D

Age of History 3
Shared: Wargame · Strategy · RTS

Oxygen Not Included
Shared: Sandbox · 2D · Strategy

Totally Accurate Battle Simulator
Shared: Sandbox · Strategy · Simulation

Bad North: Jotunn Edition
Shared: Wargame · RTS · Minimalist

Don't Starve Together
Shared: Sandbox · Difficult · Survival

Total War: WARHAMMER
Shared: 4X · Strategy · RTS

Ultimate Epic Battle Simulator 2
Shared: Sandbox · Wargame · Strategy

Power & Revolution 2022 Edition
Shared: 4X · Sandbox · Strategy

Wargame: Red Dragon
Shared: Wargame · RTS · Strategy

Power & Revolution 2021 Edition
Shared: 4X · Sandbox · Strategy

Terra Invicta
Shared: 4X · Strategy · Sandbox

Dungeon of the ENDLESS™
Shared: Strategy · Roguelike · Pixel Graphics

Rusted Warfare - RTS
Shared: RTS · Strategy · Sandbox

Broken Arrow
Shared: Wargame · Strategy · RTS

Elin
Shared: Roguelike · Sandbox · Pixel Graphics