Games like Tortuga City
Games like Tortuga City include SANABI, Until We Die, Creeper World 3: Arc Eternal, Rise to Ruins, and Grim Nights. We matched them by the tags players give Tortuga City on Steam (Indie, Strategy, Tower Defense, Pixel Graphics, and RTS): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Pixel Graphics · Indie · 2D Platformer

Until We Die
Shared: Strategy · Pixel Graphics · Tower Defense

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

Rise to Ruins
Shared: Tower Defense · Strategy · Pixel Graphics

Grim Nights
Shared: Strategy · Tower Defense · Side Scroller

Rain World
Shared: Indie · Pixel Graphics · Atmospheric

The Escapists
Shared: Strategy · Pixel Graphics · Indie

Dungeon of the ENDLESS™
Shared: Strategy · Tower Defense · Indie

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

Celeste
Shared: Indie · Pixel Graphics · 2D Platformer

Tooth and Tail
Shared: Strategy · Indie · Pixel Graphics

Dungeon Warfare
Shared: Strategy · Indie · Tower Defense

Papers, Please
Shared: Indie · Pixel Graphics · Atmospheric

The King is Watching
Shared: Tower Defense · RTS · Strategy

Rusted Warfare - RTS
Shared: Strategy · RTS · Indie

Skul: The Hero Slayer
Shared: Indie · Pixel Graphics · 2D

Wall World
Shared: Tower Defense · Pixel Graphics · Strategy

They Are Billions
Shared: Strategy · Tower Defense · RTS

Katana ZERO
Shared: Pixel Graphics · Indie · 2D Platformer

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Indie

Stoneshard
Shared: Strategy · Pixel Graphics · 2D

Super Meat Boy
Shared: Indie · Pixel Graphics · 2D Platformer

Warpips
Shared: Strategy · Tower Defense · RTS

Infested Planet
Shared: Strategy · Tower Defense · Indie