Games like Trigonomis
Games like Trigonomis include Brawlhalla, Garry's Mod, Stardew Valley, 鬼谷八荒 Tale of Immortal, and The Sims™ 4. We matched them by the tags players give Trigonomis on Steam (Casual, RPG, Simulation, 2D Fighter, and Sandbox): closest matches first, and among equally close ones the better-known games.

Brawlhalla
Shared: Casual · 2D Fighter · 2D Platformer

Garry's Mod
Shared: Sandbox · Casual · Simulation

Stardew Valley
Shared: RPG · Simulation · Sandbox

鬼谷八荒 Tale of Immortal
Shared: Simulation · RPG · Sandbox

The Sims™ 4
Shared: Simulation · Sandbox · Casual

The Scroll of Taiwu : Beyond The Dome
Shared: RPG · Sandbox · Simulation

PowerWash Simulator
Shared: Casual · Simulation · Sandbox

SPORE™
Shared: Simulation · Sandbox · Casual

The Sims™ 3
Shared: Simulation · Casual · Sandbox

Your Only Move Is HUSTLE
Shared: 2D Fighter · Simulation · Sandbox

Trove
Shared: Sandbox · RPG · Free to Play

Mount & Blade II: Bannerlord
Shared: RPG · Sandbox · Simulation

Potion Craft: Alchemist Simulator
Shared: Simulation · Casual · Sandbox

Touhou Mystia's Izakaya
Shared: Casual · Simulation · RPG

My Time at Portia
Shared: RPG · Casual · Simulation

Once Human
Shared: Free to Play · RPG · Simulation

Infinity Nikki
Shared: Casual · RPG · Simulation

People Playground
Shared: Sandbox · Simulation · 2D

Endless Sky
Shared: Simulation · RPG · Free to Play

House Flipper
Shared: Simulation · Casual · Sandbox

Albion Online
Shared: RPG · Sandbox · Free to Play

Terraria
Shared: Sandbox · 2D · Multiplayer

Growtopia
Shared: Casual · Simulation · Sandbox

Crusader Kings II
Shared: Simulation · RPG · Sandbox