Games like Oceanarium
Games like Oceanarium include Slime Rancher, ABZU, A Short Hike, Big Walk, and DAVE THE DIVER. We matched them by the tags players give Oceanarium on Steam (Adventure, Exploration, Open World, Cinematic, and Psychedelic): closest matches first, and among equally close ones the better-known games.

Slime Rancher
Shared: Exploration · Adventure · Open World

ABZU
Shared: Exploration · Adventure · Relaxing

A Short Hike
Shared: Exploration · Adventure · Open World

Big Walk
Shared: Exploration · Adventure · Open World

DAVE THE DIVER
Shared: Adventure · Exploration · Casual

Starbound
Shared: Adventure · Sandbox · Open World

No Man's Sky
Shared: Open World · Exploration · Adventure

SPORE™
Shared: Open World · Exploration · Sandbox

AER Memories of Old
Shared: Adventure · Exploration · Open World

Terraria
Shared: Adventure · Sandbox · Exploration

Fallout 4
Shared: Open World · Exploration · Adventure

Hello Kitty Island Adventure
Shared: Adventure · Open World · Exploration

Subnautica
Shared: Open World · Exploration · Adventure

EVE Online
Shared: Exploration · Adventure · Open World

Yonder: The Cloud Catcher Chronicles
Shared: Adventure · Open World · Exploration

Thank Goodness You're Here!
Shared: Adventure · Exploration · Casual

DEATH STRANDING DIRECTOR'S CUT
Shared: Open World · Adventure · Cinematic

Wobbly Life
Shared: Adventure · Open World · Sandbox

The Long Dark
Shared: Open World · Exploration · Adventure

LEGO® Worlds
Shared: Open World · Adventure · Exploration

Loddlenaut
Shared: Open World · Adventure · Underwater

Keplerth
Shared: Exploration · Adventure · Open World

Grow Home
Shared: Adventure · Open World · Exploration

Carto
Shared: Exploration · Adventure · Hand-drawn