Games like Nomnomia
Games like Nomnomia include PUBG: BATTLEGROUNDS, Feed and Grow: Fish, Escape From Duckov, Melatonin, and Pizza Tower. We matched them by the tags players give Nomnomia on Steam (Action, Shooter, Colorful, Cute, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

PUBG: BATTLEGROUNDS
Shared: Shooter · Survival · Action

Feed and Grow: Fish
Shared: Action · Survival · Underwater

Escape From Duckov
Shared: Action · Shooter · Cute

Melatonin
Shared: Cute · Colorful · Indie

Pizza Tower
Shared: 2D Platformer · Indie · Action

Webbed
Shared: Cute · 2D Platformer · 2D

My Friend Pedro
Shared: Action · Shooter · Indie

SANABI
Shared: Action · 2D Platformer · 2D

Cat Goes Fishing
Shared: Cute · 2D · Indie

ShellShock Live
Shared: Action · Shooter · 2D

Strike Force Heroes
Shared: Action · Shooter · 2D

KovaaK's
Shared: Action · Shooter · Indie

Muse Dash
Shared: Cute · Colorful · 2D

12 is Better Than 6
Shared: Action · Shooter · 2D

STAR WARS™ Battlefront™ II
Shared: Shooter · Action · Singleplayer

Broforce
Shared: Action · 2D · Shooter

Left 4 Dead 2
Shared: Shooter · Action · Survival

Door Kickers: Action Squad
Shared: Action · 2D Platformer · Shooter

Katana ZERO
Shared: Action · 2D Platformer · 2D

Skul: The Hero Slayer
Shared: Action · Indie · 2D

Hotline Miami
Shared: Action · Indie · Top-Down

The Mean Greens - Plastic Warfare
Shared: Action · Shooter · Colorful

Call of Duty®
Shared: Shooter · Action · Singleplayer

Counter-Strike 2
Shared: Shooter · Action

