Games like Gemspire: Incremental Invasion
Games like Gemspire: Incremental Invasion include Kingdom Rush - Tower Defense, Kingdom Rush 5: Alliance TD, Kingdom Rush Frontiers - Tower Defense, Plants vs. Zombies GOTY Edition, and Bloons TD 6. We matched them by the tags players give Gemspire: Incremental Invasion on Steam (Strategy, Tower Defense, Bullet Hell, 2D, and Fantasy): closest matches first, and among equally close ones the better-known games.

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

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

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

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Strategy · 2D

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

GemCraft - Chasing Shadows
Shared: Strategy · Tower Defense · Fantasy

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

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

Dungeon Warfare
Shared: Strategy · Tower Defense · 2D

Orcs Must Die! 3
Shared: Tower Defense · Strategy · PvE

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

Orcs Must Die!
Shared: Tower Defense · Strategy · Fantasy

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Fantasy

Defense Grid: The Awakening
Shared: Strategy · Tower Defense · Futuristic

Vampire Survivors
Shared: Bullet Hell · 2D · Indie

Necrosmith
Shared: Tower Defense · Strategy · Bullet Hell

Dungeon Defenders
Shared: Tower Defense · Strategy · Singleplayer

Relic Guardian - Tower Defense
Shared: Strategy · Tower Defense · 2D

Warstone TD
Shared: Strategy · Tower Defense · Fantasy

Legion TD 2 - Multiplayer Tower Defense
Shared: Tower Defense · Strategy · PvE

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

Bloons TD 5
Shared: Strategy · Tower Defense · 2D

DELTARUNE
Shared: Bullet Hell · 2D · Singleplayer

Mindustry
Shared: Tower Defense · Strategy · 2D