Games like Last Signal
Games like Last Signal include What Remains of Edith Finch, Firewatch, Outer Wilds, Gone Home, and STEINS;GATE. We matched them by the tags players give Last Signal on Steam (Visual Novel, Short, Walking Simulator, Sci-fi, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

What Remains of Edith Finch
Shared: Walking Simulator · Story Rich · Exploration

Firewatch
Shared: Walking Simulator · Story Rich · Exploration

Outer Wilds
Shared: Exploration · Space · Story Rich

Gone Home
Shared: Short · Walking Simulator · Exploration

STEINS;GATE
Shared: Visual Novel · Sci-fi · Story Rich

Tacoma
Shared: Walking Simulator · Sci-fi · Story Rich

The Invincible
Shared: Walking Simulator · Sci-fi · Multiple Endings

Amnesia: A Machine For Pigs
Shared: Walking Simulator · Story Rich · Exploration

Detroit: Become Human
Shared: Multiple Endings · Story Rich · Choices Matter

The Stanley Parable
Shared: Walking Simulator · Multiple Endings · Indie

Event[0]
Shared: Interactive Fiction · Sci-fi · Exploration

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Multiple Endings · Interactive Fiction

Zero Escape: The Nonary Games
Shared: Visual Novel · Story Rich · Multiple Endings

OPUS: Echo of Starsong - Full Bloom Edition
Shared: Visual Novel · Story Rich · Interactive Fiction

The Beginner's Guide
Shared: Walking Simulator · Short · Story Rich

Road 96: Mile 0
Shared: Visual Novel · Walking Simulator · Interactive Fiction

Deliver Us The Moon
Shared: Sci-fi · Space · Story Rich

Aliya: Timelink
Shared: Visual Novel · Interactive Fiction · Multiple Endings

The Forgotten City
Shared: Exploration · Story Rich · Mystery

Mirror 2: Project X
Shared: Visual Novel · Interactive Fiction · Multiple Endings

CARIMARA: Beneath the forlorn limbs
Shared: Story Rich · Exploration · Walking Simulator

Starfield
Shared: Sci-fi · Space · Exploration

STEINS;GATE 0
Shared: Visual Novel · Sci-fi · Story Rich

AI: The Somnium Files
Shared: Visual Novel · Sci-fi · Story Rich