Games like Mission Whilkas
Games like Mission Whilkas include Stray, A Story About My Uncle, INSIDE, Little Nightmares, and FAR: Lone Sails. We matched them by the tags players give Mission Whilkas on Steam (Adventure, Singleplayer, Platformer, 2.5D, and Voxel): closest matches first, and among equally close ones the better-known games.

Stray
Shared: Adventure · Singleplayer · Cats

A Story About My Uncle
Shared: Adventure · Singleplayer · Platformer

INSIDE
Shared: 2.5D · Singleplayer · Adventure

Little Nightmares
Shared: Adventure · Singleplayer · Atmospheric

FAR: Lone Sails
Shared: Adventure · Singleplayer · 2.5D

Ori and the Will of the Wisps
Shared: Platformer · Singleplayer · Adventure

Slime Rancher
Shared: Adventure · Singleplayer · Cute

Refunct
Shared: Parkour · Platformer · 3D Platformer

Hollow Knight
Shared: Platformer · Singleplayer · Adventure

Night in the Woods
Shared: Adventure · Singleplayer · Stylized

Little Nightmares II
Shared: Adventure · Singleplayer · Atmospheric

Cairn
Shared: Adventure · Singleplayer · Stylized

A Hat in Time
Shared: Adventure · Cute · Platformer

GRIS
Shared: Adventure · Platformer · Singleplayer

Portal 2
Shared: Singleplayer · Platformer · Adventure

Seen
Shared: Singleplayer · Adventure · Platformer

Deadlight
Shared: Platformer · Adventure · Singleplayer

The Darkest Tales — Into the Nightmare
Shared: Adventure · Platformer · 2.5D

The Last Campfire
Shared: Adventure · Singleplayer · Cute

Celeste
Shared: Platformer · Singleplayer · Adventure

Slime Rancher 2
Shared: Singleplayer · Adventure · Cute

Chants of Sennaar
Shared: Adventure · Singleplayer · Atmospheric

Chained Together
Shared: Adventure · Platformer · Casual

LIMBO
Shared: Platformer · Adventure · Singleplayer