Games like Fastigium
Games like Fastigium include Notes of Soul, Cat Quest, Caster, Juicy Realm, and The Walking Dead: Saints & Sinners. We matched them by the tags players give Fastigium on Steam (Adventure, Action, Indie, Casual, and RPG): closest matches first, and among equally close ones the better-known games.

Notes of Soul
Shared: Action · Adventure · Horror

Cat Quest
Shared: Adventure · Action · RPG

Caster
Shared: Action · Adventure · Indie

Juicy Realm
Shared: Action · Adventure · Indie

The Walking Dead: Saints & Sinners
Shared: Action · Adventure · VR

Duck Season
Shared: Action · Adventure · Horror

G2 Fighter / 基因特工
Shared: Adventure · Action · RPG

Idle Champions of the Forgotten Realms
Shared: Adventure · Free to Play · Indie

Accounting+
Shared: Adventure · Action · Indie

Five Nights at Freddy's: Secret of the Mimic
Shared: Adventure · Action · Horror

Dark Deception
Shared: Horror · Free to Play · Indie

Marvel Rivals
Shared: Free to Play · Action · Adventure

Bladed fury
Shared: Action · Indie · Adventure

[Chillas Art] The Convenience Store
Shared: Indie · Adventure · Horror

Darkwood
Shared: Adventure · Action · Horror

Dust: An Elysian Tail
Shared: Action · Indie · Adventure

Wuthering Waves
Shared: Action · Adventure · RPG

Neverwinter
Shared: Adventure · RPG · Free to Play

Pikuniku
Shared: Adventure · Indie · Casual

Plebby Quest: The Crusades
Shared: Indie · Casual · Adventure

Jet Island
Shared: Action · Adventure · Indie

Melvor Idle
Shared: Indie · Casual · RPG

Spooky's Jump Scare Mansion: HD Renovation
Shared: Adventure · Indie · Horror

Orion Sandbox Enhanced
Shared: Adventure · Action · Indie