Games like Alien Planet Explorer
Games like Alien Planet Explorer include Hollow Knight, FEZ, Thank Goodness You're Here!, Labyrinth City: Pierre the Maze Detective, and Hidden Folks. We matched them by the tags players give Alien Planet Explorer on Steam (Exploration, Hidden Object, Puzzle, Platformer, and 2D): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Exploration · 2D

FEZ
Shared: Puzzle · Platformer · Exploration

Thank Goodness You're Here!
Shared: Exploration · Hand-drawn · Casual

Labyrinth City: Pierre the Maze Detective
Shared: Hidden Object · Puzzle · Casual

Hidden Folks
Shared: Hidden Object · Puzzle · Casual

GRIS
Shared: Platformer · Hand-drawn · 2D

Carto
Shared: Exploration · Puzzle · Hand-drawn

Hollow Knight: Silksong
Shared: Exploration · 2D · Platformer

Morphopolis
Shared: Puzzle · Hidden Object · Casual

Sizeable
Shared: Hidden Object · Puzzle · Exploration

Gorogoa
Shared: Puzzle · Hand-drawn · Casual

ANIMAL WELL
Shared: Exploration · Puzzle · Platformer

TOEM: A Photo Adventure
Shared: Puzzle · Exploration · Casual

Milo and the Magpies
Shared: Hidden Object · Exploration · Hand-drawn

Laughing to Die
Shared: Puzzle · Platformer · Casual

Rain World
Shared: Exploration · Platformer · 2D

Strange Jigsaws
Shared: Puzzle · Casual · 2D

Slime Rancher
Shared: Exploration · Colorful · Casual

LIMBO
Shared: Puzzle · Platformer · 2D

The Artisan of Glimmith
Shared: Puzzle · Exploration · Casual

Ori and the Will of the Wisps
Shared: Platformer · Exploration · Puzzle

Sanfu
Shared: Puzzle · 2D · Hand-drawn

The Witness
Shared: Exploration · Puzzle · Colorful

Storyteller
Shared: Puzzle · 2D · Hand-drawn