Games like Transpire
Games like Transpire include Refunct, A Story About My Uncle, Portal 2, Portal, and Clustertruck. We matched them by the tags players give Transpire on Steam (3D Platformer, Parkour, First-Person, Relaxing, and Casual): closest matches first, and among equally close ones the better-known games.

Refunct
Shared: 3D Platformer · Parkour · Relaxing

A Story About My Uncle
Shared: Parkour · First-Person · 3D Platformer

Portal 2
Shared: First-Person · Platformer · 3D Platformer

Portal
Shared: 3D Platformer · First-Person · Puzzle Platformer

Clustertruck
Shared: Parkour · 3D Platformer · First-Person

VHOLUME
Shared: Parkour · 3D Platformer · First-Person

Mirror's Edge™
Shared: Parkour · First-Person · 3D Platformer

Slime Rancher 2
Shared: Relaxing · First-Person · Singleplayer

Neon White
Shared: 3D Platformer · Parkour · Platformer

Mirror's Edge™ Catalyst
Shared: Parkour · 3D Platformer · First-Person

FrostRunner
Shared: Parkour · 3D Platformer · First-Person

Cyber Hook
Shared: 3D Platformer · Parkour · First-Person

SEUM: Speedrunners from Hell
Shared: 3D Platformer · Parkour · First-Person

PowerWash Simulator
Shared: Casual · Relaxing · First-Person

White Knuckle
Shared: Parkour · First-Person · 3D Platformer

Chained Together
Shared: Casual · Platformer · 3D Platformer

MEANDERS
Shared: 3D Platformer · Parkour · Casual

Climber Animals: Together
Shared: 3D Platformer · Casual · Platformer

Haste
Shared: Parkour · 3D Platformer · Singleplayer

Quantum Conundrum
Shared: 3D Platformer · First-Person · Puzzle Platformer

Gorilla Tag
Shared: First-Person · Parkour · 3D Platformer

Viewfinder
Shared: First-Person · Puzzle Platformer · Singleplayer

Valley
Shared: First-Person · Parkour · Indie

Supraland
Shared: Puzzle Platformer · First-Person · 3D Platformer