Games like Water Planet
Games like Water Planet include Feed and Grow: Fish, Rick and Morty: Virtual Rick-ality, VERGE:Lost chapter, ADR1FT, and Firewatch. We matched them by the tags players give Water Planet on Steam (Adventure, Indie, Simulation, Walking Simulator, and Underwater): closest matches first, and among equally close ones the better-known games.

Feed and Grow: Fish
Shared: Simulation · Underwater · Indie

Rick and Morty: Virtual Rick-ality
Shared: Adventure · VR · Simulation

VERGE:Lost chapter
Shared: Indie · Adventure · Walking Simulator

ADR1FT
Shared: Adventure · Indie · VR

Firewatch
Shared: Adventure · Walking Simulator · Indie

Scanner Sombre
Shared: Adventure · Walking Simulator · Indie

Internet Cafe Simulator
Shared: Indie · Simulation · Adventure

Jet Island
Shared: Adventure · VR · Indie

Hard Bullet
Shared: VR · Simulation · Indie

The Stanley Parable
Shared: Indie · Walking Simulator · Adventure

Totally Accurate Battle Simulator
Shared: Simulation · Indie · Adventure

Narcosis
Shared: Adventure · Indie · Underwater

Wobbly Life
Shared: Adventure · Simulation · Indie

Beyond Blue
Shared: Adventure · Indie · Underwater

Rise of Insanity
Shared: Adventure · Indie · Simulation

Journey
Shared: Adventure · Indie · Walking Simulator

SURV1V3
Shared: Adventure · VR · Simulation

Obduction
Shared: Adventure · Indie · VR

[Chillas Art] The Convenience Store
Shared: Indie · Adventure · Simulation

Dream
Shared: Adventure · Indie · Walking Simulator

Microsoft Flight Simulator (2020) 40th Anniversary Edition
Shared: Simulation · VR · Adventure

Accounting+
Shared: Adventure · Indie · VR

NoLimits 2 Roller Coaster Simulation
Shared: Simulation · VR · Indie

Investigator
Shared: Adventure · Indie · Simulation