Games like Siege the Day
Games like Siege the Day include Forts, Foxhole, Space Engineers, Mindustry, and Totally Accurate Battle Simulator. We matched them by the tags players give Siege the Day on Steam (Wargame, Base Building, Turn-Based Tactics, Tower Defense, and Strategy): closest matches first, and among equally close ones the better-known games.
Forts
Shared: Base Building · Strategy · Building
Foxhole
Shared: Wargame · Base Building · Sandbox
Space Engineers
Shared: Building · Sandbox · Base Building
Mindustry
Shared: Base Building · Tower Defense · Strategy
Totally Accurate Battle Simulator
Shared: Sandbox · Strategy · PvP
Total War: WARHAMMER II
Shared: Strategy · Turn-Based Strategy · PvP
Squad
Shared: PvP · Wargame · Multiplayer
Thronefall
Shared: Tower Defense · Strategy · Base Building
7 Days to Die
Shared: Base Building · Multiplayer · PvP
Legion TD 2 - Multiplayer Tower Defense
Shared: PvP · Tower Defense · Strategy
Heroes of Might and Magic: Olden Era
Shared: Strategy · Turn-Based Tactics · Multiplayer
Kingdom Two Crowns
Shared: Tower Defense · Base Building · Building
The Riftbreaker
Shared: Base Building · Tower Defense · Multiplayer
Prison Architect
Shared: Base Building · Building · Sandbox
Besiege
Shared: Sandbox · PvP · Building
Factorio
Shared: Base Building · Strategy · Sandbox
WARDOGS
Shared: PvP · Wargame · Multiplayer
Bloons TD 6
Shared: Tower Defense · Strategy · Multiplayer
Garry's Mod
Shared: Sandbox · Building · Multiplayer
Rust
Shared: PvP · Building · Multiplayer
ARK: Survival Ascended
Shared: Base Building · Multiplayer · Building
Creeper World 4
Shared: Wargame · Tower Defense · Building
Mechabellum
Shared: Wargame · PvP · Strategy
Scrap Mechanic
Shared: Building · Sandbox · Base Building