Games like Jawless Fishtank
Games like Jawless Fishtank include Melvor Idle, Cookie Clicker, Bongo Cat, Keep on Mining!, and Cat Goes Fishing. We matched them by the tags players give Jawless Fishtank on Steam (Casual, Idler, 2D, Cartoon, and Underwater): closest matches first, and among equally close ones the better-known games.

Melvor Idle
Shared: Idler · Casual · 2D

Cookie Clicker
Shared: Idler · Casual · Indie

Bongo Cat
Shared: Idler · Casual · 2D

Keep on Mining!
Shared: Idler · Casual · Singleplayer

Cat Goes Fishing
Shared: 2D · Casual · Indie

Zup! S
Shared: Casual · 2D · Indie

Vampire Survivors
Shared: 2D · Casual · Indie

Game Dev Tycoon
Shared: Casual · Indie · 2D

A Game About Feeding A Black Hole
Shared: Casual · Idler · 2D

Kingdom Rush - Tower Defense
Shared: 2D · Casual · Singleplayer

To The Core
Shared: Casual · 2D · Indie

DAVE THE DIVER
Shared: Casual · Singleplayer · Underwater

Plants vs. Zombies GOTY Edition
Shared: Casual · Singleplayer · 2D

Idle Champions of the Forgotten Realms
Shared: Idler · Singleplayer · Casual

Click the Button
Shared: Casual · Idler · Indie

Timberman
Shared: Casual · 2D · Indie

TBH: Task Bar Hero
Shared: Idler · Casual · Indie

Cuphead
Shared: Cartoon · 2D · Indie

A Dance of Fire and Ice
Shared: 2D · Singleplayer · Indie

Nodebuster
Shared: Casual · Idler · 2D

Swords and Souls: Neverseen
Shared: Indie · Singleplayer · 2D

Deep Space Cache
Shared: Casual · Idler · Indie

Timber Rush
Shared: Casual · Idler · Indie

Kingdom Rush Frontiers - Tower Defense
Shared: 2D · Singleplayer · Casual