Games like Fishman's Last Stand
Games like Fishman's Last Stand include Bloons TD 6, Ultimate Epic Battle Simulator 2, Portal Knights, Slime Rancher, and Mount & Blade: Warband. We matched them by the tags players give Fishman's Last Stand on Steam (Action, Adventure, Casual, Strategy, and Auto Battler): closest matches first, and among equally close ones the better-known games.

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

Ultimate Epic Battle Simulator 2
Shared: Action · Strategy · Sandbox

Portal Knights
Shared: Adventure · Sandbox · Action

Slime Rancher
Shared: Adventure · Exploration · Casual

Mount & Blade: Warband
Shared: Strategy · Action · Sandbox

SMITE 2
Shared: Action · Strategy · Adventure

SPORE™
Shared: Sandbox · Casual · Exploration

Terraria
Shared: Sandbox · Adventure · Exploration

Planet Coaster
Shared: Sandbox · Strategy · Action

Totally Accurate Battle Simulator
Shared: Sandbox · Strategy · Adventure

Bloons TD 5
Shared: Strategy · Action · Tower Defense

Mount & Blade II: Bannerlord
Shared: Strategy · Action · Sandbox

Once Human
Shared: Action · Adventure · Exploration

Gothic 1 Remake
Shared: Adventure · Action · Exploration

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

s&box
Shared: Action · Casual · Sandbox

Growtopia
Shared: Adventure · Casual · Sandbox

鬼谷八荒 Tale of Immortal
Shared: Sandbox · Action · Adventure

Just Cause 2
Shared: Action · Adventure · Sandbox

Tomb Raider Game of the Year
Shared: Action · Adventure · Exploration

SPORE™ Galactic Adventures
Shared: Action · Adventure · Sandbox

Starbound
Shared: Adventure · Sandbox · Casual

Rise of the Tomb Raider™
Shared: Action · Adventure · Exploration

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