Games like Champs TD
Games like Champs TD include Age of Darkness: Final Stand, They Are Billions, The King is Watching, Mindustry, and Legion TD 2 - Multiplayer Tower Defense. We matched them by the tags players give Champs TD on Steam (Strategy, Tower Defense, RTS, Fantasy, and Resource Management): closest matches first, and among equally close ones the better-known games.

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · RTS

They Are Billions
Shared: Strategy · RTS · Tower Defense

The King is Watching
Shared: Tower Defense · RTS · Strategy

Mindustry
Shared: Tower Defense · Strategy · RTS

Legion TD 2 - Multiplayer Tower Defense
Shared: Tower Defense · Strategy · Auto Battler

Age of Empires II (Retired)
Shared: Strategy · RTS · Resource Management

Diplomacy is Not an Option
Shared: Resource Management · RTS · Base Building

Tower Dominion
Shared: Strategy · Tower Defense · RTS

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

Age of Mythology: Retold
Shared: Strategy · RTS · Base Building

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Fantasy

Frostpunk
Shared: Strategy · Resource Management · Survival

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Tower Defense · Fantasy

Warpips
Shared: Strategy · Tower Defense · RTS

Thronefall
Shared: Strategy · Tower Defense · Base Building

This War of Mine
Shared: Strategy · Survival · Resource Management

Total War: WARHAMMER II
Shared: Strategy · Fantasy · RTS

Oxygen Not Included
Shared: Resource Management · Survival · Base Building

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

Creeper World 3: Arc Eternal
Shared: Strategy · Tower Defense · RTS

Dungeon Defenders
Shared: Tower Defense · Strategy · Survival

Factorio
Shared: Strategy · Resource Management · Base Building

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

Grim Nights
Shared: Strategy · Tower Defense · Survival