Games like Liminal 98
Games like Liminal 98 include Firewatch, The Exit 8, PEAK, Hamster Hunter, and Scanner Sombre. We matched them by the tags players give Liminal 98 on Steam (Exploration, Runner, Walking Simulator, Casual, and Arcade): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Walking Simulator · Exploration · First-Person

The Exit 8
Shared: Exploration · Walking Simulator · Horror

PEAK
Shared: Exploration · First-Person · 3D

Hamster Hunter
Shared: Exploration · Arcade · 3D

Scanner Sombre
Shared: Exploration · Walking Simulator · Horror

Five Nights at Freddy's: Security Breach
Shared: Exploration · Horror · First-Person

Escape the Backrooms
Shared: Horror · Exploration · First-Person

Fears to Fathom - Woodbury Getaway
Shared: Casual · Exploration · First-Person

Lethal Company
Shared: Exploration · First-Person · Horror

What Remains of Edith Finch
Shared: Walking Simulator · Exploration · First-Person

NaissanceE
Shared: Exploration · Walking Simulator · First-Person

Slime Rancher
Shared: Exploration · First-Person · Casual

RATSHAKER™
Shared: Exploration · First-Person · Horror

Proteus
Shared: Exploration · Walking Simulator · Casual

Content Warning
Shared: Exploration · Horror · Procedural Generation

DAVE THE DIVER
Shared: Casual · Exploration · Pixel Graphics

Fears to Fathom® - Scratch Creek
Shared: Horror · Casual · Walking Simulator

CARIMARA: Beneath the forlorn limbs
Shared: Exploration · 3D · Walking Simulator

Internet Cafe Simulator 2
Shared: Exploration · 3D · First-Person

Baldi's Basics Plus
Shared: Horror · Exploration · Procedural Generation

Interior Worlds
Shared: Exploration · Walking Simulator · Casual

A Game About Digging A Hole
Shared: Exploration · Horror · Procedural Generation

Amnesia: A Machine For Pigs
Shared: Walking Simulator · Exploration · Horror

Five Nights at Freddy's: Secret of the Mimic
Shared: Exploration · First-Person · Horror