Games like Stackmon
Games like Stackmon include Stacklands, Slime Rancher, Slime Rancher 2, Planet Coaster, and Aniimo. We matched them by the tags players give Stackmon on Steam (Creature Collector, Card Game, Card Battler, Strategy, and Adventure): closest matches first, and among equally close ones the better-known games.

Stacklands
Shared: Card Game · Card Battler · Strategy

Slime Rancher
Shared: Adventure · Exploration · Cute

Slime Rancher 2
Shared: Creature Collector · Cute · Adventure

Planet Coaster
Shared: Simulation · Strategy · Building

Aniimo
Shared: Creature Collector · Adventure · Exploration

Slay the Spire
Shared: Card Game · Card Battler · Strategy

Kabuto Park
Shared: Creature Collector · Card Battler · Cute

Moonstone Island
Shared: Creature Collector · 2D · Card Battler

Terraria
Shared: Adventure · 2D · Exploration

Yaoling: Mythical Journey
Shared: Creature Collector · Strategy · Adventure

Slay the Spire 2
Shared: Card Game · Strategy · Card Battler

Inscryption
Shared: Card Game · Card Battler · Strategy

Growtopia
Shared: Adventure · Simulation · Exploration

Hello Kitty Island Adventure
Shared: Adventure · Simulation · Exploration

Stray Path
Shared: Card Battler · Strategy · Card Game

Totally Accurate Battle Simulator
Shared: Strategy · Simulation · Adventure

Balatro
Shared: Card Game · Strategy · Card Battler

Ooblets
Shared: Creature Collector · Card Battler · Exploration

Two Point Museum
Shared: Strategy · Simulation · Building

Esports Godfather
Shared: Card Battler · Strategy · Card Game

Ratropolis
Shared: Card Battler · Strategy · Card Game

The Escapists
Shared: Strategy · Simulation · 2D

DAVE THE DIVER
Shared: Adventure · Exploration · Simulation

Gordian Quest
Shared: Card Game · Card Battler · Strategy