Games like Rift Riff
Games like Rift Riff include Thronefall, Kingdom Two Crowns, They Are Billions, Mindustry, and Bee Island. We matched them by the tags players give Rift Riff on Steam (Tower Defense, Minimalist, Strategy, Base Building, and PvE): closest matches first, and among equally close ones the better-known games.

Thronefall
Shared: Tower Defense · Strategy · Minimalist

Kingdom Two Crowns
Shared: Tower Defense · Minimalist · Base Building

They Are Billions
Shared: Base Building · Strategy · Tower Defense

Mindustry
Shared: Tower Defense · Base Building · Strategy

Bee Island
Shared: Tower Defense · Strategy · Minimalist

Kingdom Rush 6: Genesis TD
Shared: Tower Defense · Strategy · Base Building

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · Base Building

Taur
Shared: Tower Defense · Strategy · Base Building

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

Minimalist Tower Defense
Shared: Tower Defense · Strategy · Minimalist

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

The Riftbreaker
Shared: Tower Defense · Base Building · Strategy

Bloons TD 6
Shared: Tower Defense · Strategy · Singleplayer

Infection Free Zone
Shared: Base Building · Strategy · RTS

Rogue Tower
Shared: Tower Defense · Strategy · Minimalist

Tempest Rising
Shared: Strategy · Base Building · RTS

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

Infested Planet
Shared: Tower Defense · Strategy · RTS

Command & Conquer Red Alert™ 2 and Yuri’s Revenge™
Shared: Strategy · RTS · Base Building

Cossacks 3
Shared: Strategy · RTS · Base Building

DG2: Defense Grid 2
Shared: Tower Defense · Strategy · Base Building

Kingdom: New Lands
Shared: Tower Defense · Minimalist · Base Building

Warhammer 40,000: Dawn of War - Definitive Edition
Shared: Strategy · RTS · Base Building

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