Games like Pocket Aquarium
Games like Pocket Aquarium include DAVE THE DIVER, There Is No Game: Wrong Dimension, Papers, Please, Cat Goes Fishing, and WEBFISHING. We matched them by the tags players give Pocket Aquarium on Steam (Creature Collector, Fishing, Arcade, Retro, and Point & Click): closest matches first, and among equally close ones the better-known games.

DAVE THE DIVER
Shared: Casual · Pixel Graphics · Fishing

There Is No Game: Wrong Dimension
Shared: Point & Click · Pixel Graphics · Casual

Papers, Please
Shared: Point & Click · Simulation · Pixel Graphics

Cat Goes Fishing
Shared: Fishing · Casual · 2D

WEBFISHING
Shared: Fishing · Creature Collector · Casual

Cast n Chill
Shared: Fishing · Creature Collector · Pixel Graphics

Beat Cop
Shared: Retro · Pixel Graphics · Simulation

UFO 50
Shared: Retro · Arcade · Pixel Graphics

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: Arcade · Casual · 2D

Scale the Depths
Shared: Fishing · Casual · Arcade

Thimbleweed Park™
Shared: Point & Click · Pixel Graphics · Retro

Stardew Valley
Shared: Pixel Graphics · Simulation · Life Sim

That's not my Neighbor
Shared: Casual · Point & Click · Simulation

Unpacking
Shared: Casual · Pixel Graphics · Simulation

McPixel
Shared: Point & Click · Comedy · Pixel Graphics

Vampire Survivors
Shared: Pixel Graphics · Arcade · Casual

Little Witch in the Woods
Shared: Pixel Graphics · Casual · Simulation

Cornerpond
Shared: Fishing · Creature Collector · Simulation

Peace, Death! 2
Shared: Casual · Arcade · Simulation

Peace, Death!
Shared: Casual · Simulation · Pixel Graphics

The Darkside Detective
Shared: Point & Click · Pixel Graphics · Adventure

Slime Rancher 2
Shared: Creature Collector · Simulation · Casual

Backyard Baseball '97
Shared: Arcade · Casual · Retro

Chill Pulse
Shared: Casual · Point & Click · Simulation