Games like The Pest
Games like The Pest include Portal 2, LIMBO, OneShot, INSIDE, and Undertale. We matched them by the tags players give The Pest on Steam (Indie, Puzzle Platformer, Platformer, Puzzle, and Linear): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Platformer · Puzzle · Singleplayer

LIMBO
Shared: Indie · Puzzle Platformer · Platformer

OneShot
Shared: Indie · Story Rich · Puzzle

INSIDE
Shared: Puzzle Platformer · Indie · Story Rich

Undertale
Shared: Story Rich · Indie · Multiple Endings

Hollow Knight
Shared: Platformer · Indie · Singleplayer

Braid
Shared: Puzzle Platformer · Indie · Puzzle

Celeste
Shared: Indie · Platformer · Singleplayer

SANABI
Shared: Story Rich · Indie · Singleplayer

Little Nightmares
Shared: Puzzle Platformer · Indie · Puzzle

Planet of Lana
Shared: Puzzle Platformer · Puzzle · Platformer

Defy Gravity Extended
Shared: Puzzle Platformer · Indie · Platformer

Portal
Shared: Puzzle Platformer · Puzzle · Singleplayer

Seen
Shared: Indie · Puzzle · Singleplayer

Ori and the Will of the Wisps
Shared: Platformer · Singleplayer · Story Rich

FEZ
Shared: Indie · Platformer · Puzzle

ElecHead
Shared: Puzzle Platformer · Platformer · Puzzle

Hollow Knight: Silksong
Shared: Indie · Platformer · Singleplayer

Oddworld: New 'n' Tasty
Shared: Puzzle Platformer · Platformer · Puzzle

Nihilumbra
Shared: Indie · Platformer · Puzzle

GRIS
Shared: Indie · Platformer · Singleplayer

Hue
Shared: Indie · Puzzle Platformer · Puzzle

The Last Campfire
Shared: Puzzle · Indie · Singleplayer

Öoo
Shared: Puzzle Platformer · Puzzle · Platformer