Games like Sporadic Spire
Games like Sporadic Spire include Creeper World 4, Bloons TD 6, Thronefall, Total War: WARHAMMER III, and Mini Motorways. We matched them by the tags players give Sporadic Spire on Steam (Action, Casual, Strategy, Tower Defense, and Real Time Tactics): closest matches first, and among equally close ones the better-known games.

Creeper World 4
Shared: Tower Defense · Real Time Tactics · Strategy

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

Thronefall
Shared: Strategy · Tower Defense · Action

Total War: WARHAMMER III
Shared: Strategy · Grand Strategy · Real Time Tactics

Mini Motorways
Shared: Strategy · Casual · Minimalist

Rogue Tower
Shared: Strategy · Tower Defense · Casual

Taur
Shared: Action · Strategy · Tower Defense

Aliens: Dark Descent
Shared: Action · Strategy · Real Time Tactics

ISLANDERS
Shared: Strategy · Minimalist · Casual

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Casual

Bloons TD 5
Shared: Strategy · Tower Defense · Action

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Strategy · Casual

Minimalist Tower Defense
Shared: Strategy · Tower Defense · Real Time Tactics

Rock 'N' Roll Defense
Shared: Casual · Strategy · Action

Ultimate Epic Battle Simulator 2
Shared: Action · Strategy · Grand Strategy

Bee Island
Shared: Strategy · Tower Defense · Action

X-Morph: Defense
Shared: Action · Strategy · Tower Defense

Infested Planet
Shared: Action · Strategy · Tower Defense

DG2: Defense Grid 2
Shared: Action · Strategy · Tower Defense

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · Casual

Total War: WARHAMMER II
Shared: Strategy · Action · Grand Strategy

Sanctum 2
Shared: Tower Defense · Action · Strategy

Total War: ROME REMASTERED
Shared: Strategy · Action · Grand Strategy

Kingdom Two Crowns
Shared: Tower Defense · Minimalist · Strategy