Games like BTR Ringfall
Games like BTR Ringfall include Plants vs. Zombies GOTY Edition, Bloons TD 6, Kingdom Rush - Tower Defense, Bloons TD 5, and Kingdom Rush Frontiers - Tower Defense. We matched them by the tags players give BTR Ringfall on Steam (Strategy, Tower Defense, Real Time Tactics, Casual, and 2D): closest matches first, and among equally close ones the better-known games.

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

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · 2D

Bloons TD 5
Shared: Strategy · Tower Defense · Casual

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Tower Defense · 2D

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · 2D

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

Kingdom Rush Vengeance - Tower Defense
Shared: Strategy · Tower Defense · 2D

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

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · 2D

Mindustry
Shared: Tower Defense · Strategy · Resource Management

Defense Grid: The Awakening
Shared: Strategy · Tower Defense · Sci-fi

Kingdom Rush 6: Genesis TD
Shared: Strategy · Tower Defense · 2D

Creeper World 3: Arc Eternal
Shared: Strategy · Tower Defense · Sci-fi

Taur
Shared: Strategy · Tower Defense · Sci-fi

ShellShock Live
Shared: Strategy · 2D · Casual

Infested Planet
Shared: Strategy · Tower Defense · Singleplayer

911 Operator
Shared: Strategy · Casual · Singleplayer

Dome Keeper
Shared: Singleplayer · Tower Defense · Sci-fi

Game Dev Tycoon
Shared: Strategy · Casual · Singleplayer

Zero Stress King: Idle Defense
Shared: Tower Defense · Strategy · Casual

Defend Your Life: TD
Shared: Tower Defense · Strategy · Casual

Super Sanctum TD
Shared: Strategy · Tower Defense · Casual

Aliens: Dark Descent
Shared: Strategy · Real Time Tactics · Sci-fi