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

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

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

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

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · Singleplayer

Banana
Shared: Casual · Singleplayer · Strategy

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

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

Idle Champions of the Forgotten Realms
Shared: Strategy · Fantasy · Adventure

Ninja Kiwi Archive
Shared: Casual · Strategy · Tower Defense

Game Dev Tycoon
Shared: Strategy · Indie · Casual

Plague Inc: Evolved
Shared: Strategy · Indie · Casual

Slime Rancher
Shared: Adventure · Singleplayer · Exploration

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

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

Melvor Idle
Shared: Casual · Indie · Adventure

Bardbarian
Shared: Strategy · Indie · Casual

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

Warstone TD
Shared: Strategy · Tower Defense · Indie

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Singleplayer

Circle Empires
Shared: Strategy · Casual · Indie

12 Labours of Hercules
Shared: Strategy · Casual · Adventure

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

Bloons TD 5
Shared: Strategy · Tower Defense · Casual