Games like Island Defense
Games like Island Defense include Rock 'N' Roll Defense, Plants vs. Zombies GOTY Edition, Kingdom Rush - Tower Defense, Bloons TD 6, and Bloons TD 5. We matched them by the tags players give Island Defense on Steam (Strategy, Indie, Tower Defense, Casual, and Action): closest matches first, and among equally close ones the better-known games.

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

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

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

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

Bloons TD 5
Shared: Strategy · Tower Defense · Action

Orcs Must Die! 2
Shared: Tower Defense · Strategy · Action

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

Rock of Ages
Shared: Strategy · Indie · Tower Defense

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

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

Overdungeon
Shared: Strategy · Indie · Casual

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

Bardbarian
Shared: Indie · Strategy · Tower Defense

Sanctum 2
Shared: Tower Defense · Strategy · Action

CastleStorm
Shared: Indie · Tower Defense · Strategy

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

Sanctum
Shared: Strategy · Tower Defense · Indie

Infested Planet
Shared: Strategy · Tower Defense · Indie

Thronefall
Shared: Strategy · Tower Defense · Action

Plague Inc: Evolved
Shared: Strategy · Indie · Casual

ShellShock Live
Shared: Strategy · Action · Casual

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

Plebby Quest: The Crusades
Shared: Strategy · Indie · Casual

Taur
Shared: Strategy · Tower Defense · Indie