Games like Zeltrus
Games like Zeltrus include Celeste, LIMBO, Out There Somewhere, SANABI, and FEZ. We matched them by the tags players give Zeltrus on Steam (Adventure, 2D Platformer, Puzzle Platformer, Sci-fi, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Pixel Graphics · 2D Platformer · Indie

LIMBO
Shared: Puzzle Platformer · Adventure · Indie

Out There Somewhere
Shared: Adventure · Pixel Graphics · Platformer

SANABI
Shared: Pixel Graphics · 2D Platformer · Adventure

FEZ
Shared: Pixel Graphics · Adventure · Platformer

Webbed
Shared: 2D Platformer · Puzzle Platformer · Pixel Graphics

MO:Astray
Shared: Adventure · Puzzle Platformer · Pixel Graphics

Portal 2
Shared: Singleplayer · Puzzle Platformer · Platformer

Mind Over Magnet
Shared: Adventure · Puzzle Platformer · 2D Platformer

Braid
Shared: Puzzle Platformer · 2D Platformer · Indie

ANIMAL WELL
Shared: Puzzle Platformer · Pixel Graphics · Adventure

Planet of Lana
Shared: Puzzle Platformer · 2D Platformer · Adventure

VVVVVV
Shared: Pixel Graphics · 2D Platformer · Indie

Owlboy
Shared: Adventure · Pixel Graphics · Indie

Squishy the Suicidal Pig
Shared: Adventure · Puzzle Platformer · Indie

Pizza Tower
Shared: 2D Platformer · Indie · Pixel Graphics

Little Nightmares
Shared: Adventure · Puzzle Platformer · Singleplayer

Super Meat Boy
Shared: 2D Platformer · Pixel Graphics · Platformer

Reventure
Shared: Adventure · Pixel Graphics · Indie

INSIDE
Shared: Puzzle Platformer · Adventure · Singleplayer

ElecHead
Shared: Puzzle Platformer · Pixel Graphics · Adventure

Defy Gravity Extended
Shared: Puzzle Platformer · Indie · Platformer

CATO: Buttered Cat
Shared: Puzzle Platformer · Adventure · Pixel Graphics

Portal
Shared: Puzzle Platformer · Sci-fi · Singleplayer