Games like IKAROS
Games like IKAROS include Samsara Room, There Is No Game: Jam Edition 2015, VRChat, Poppy Playtime, and The Mr. Rabbit Magic Show. We matched them by the tags players give IKAROS on Steam (Free to Play, Adventure, Indie, and Puzzle): closest matches first, and among equally close ones the better-known games.

Samsara Room
Shared: Indie · Adventure · Free to Play

There Is No Game: Jam Edition 2015
Shared: Free to Play · Indie · Adventure

VRChat
Shared: Free to Play · VR · Adventure

Poppy Playtime
Shared: Free to Play · Puzzle · Indie

The Mr. Rabbit Magic Show
Shared: Adventure · Free to Play · Puzzle

Hello Neighbor Alpha 4
Shared: Free to Play · Adventure · Indie

We Were Here
Shared: Free to Play · Puzzle · Adventure

Varenje
Shared: Free to Play · Adventure · Indie

Chants of Sennaar
Shared: Adventure · Puzzle · Indie

There Is No Game: Wrong Dimension
Shared: Indie · Adventure · Puzzle

Idle Champions of the Forgotten Realms
Shared: Free to Play · Adventure · Indie

Outcore: Desktop Adventure
Shared: Adventure · Free to Play · Puzzle

Obduction
Shared: Adventure · Indie · Puzzle

The Room VR: A Dark Matter
Shared: Adventure · VR · Puzzle

War Thunder
Shared: Free to Play · VR · Free To Play

Where Winds Meet
Shared: Free to Play · Adventure · Indie

The Last Campfire
Shared: Adventure · Puzzle · Indie

LIMBO
Shared: Indie · Puzzle · Adventure

Brothers - A Tale of Two Sons
Shared: Adventure · Indie · Puzzle

BONEWORKS
Shared: VR · Adventure · Puzzle

Pikuniku
Shared: Adventure · Indie · Puzzle

月圆之夜 (Night of Full Moon)
Shared: Free to Play · Indie · Adventure

Moss VR
Shared: Adventure · VR · Puzzle

Murders on the Yangtze River
Shared: Adventure · Puzzle · Indie