Games like Nerds & Ammo
Games like Nerds & Ammo include Portal, Portal 2, Half-Life 2, Human Fall Flat, and Supraland. We matched them by the tags players give Nerds & Ammo on Steam (Action, Puzzle Platformer, First-Person, 3D Platformer, and Physics): closest matches first, and among equally close ones the better-known games.

Portal
Shared: Puzzle Platformer · First-Person · 3D Platformer

Portal 2
Shared: First-Person · Puzzle Platformer · Puzzle

Half-Life 2
Shared: Action · Sci-fi · First-Person

Human Fall Flat
Shared: Physics · Puzzle Platformer · Puzzle

Supraland
Shared: Puzzle Platformer · First-Person · Adventure

Black Mesa
Shared: Action · First-Person · Sci-fi

BioShock Infinite
Shared: Action · First-Person · Adventure

PEAK
Shared: Physics · First-Person · Adventure

Suicide Guy
Shared: Action · Physics · Puzzle

Viewfinder
Shared: Puzzle Platformer · First-Person · Puzzle

Quantum Conundrum
Shared: Puzzle Platformer · First-Person · 3D Platformer

The Ball
Shared: Puzzle Platformer · 3D Platformer · First-Person

Superliminal
Shared: First-Person · Puzzle · Physics

Half-Life: Opposing Force
Shared: Action · Sci-fi · First-Person

Planet of Lana
Shared: Action · Puzzle Platformer · Puzzle

Atomic Heart
Shared: Action · Adventure · Sci-fi

Half-Life: Blue Shift
Shared: Action · Sci-fi · First-Person

Half-Life 2: Deathmatch
Shared: Action · First-Person · Sci-fi

Mirror's Edge™ Catalyst
Shared: First-Person · Action · 3D Platformer

BONEWORKS
Shared: Action · Physics · First-Person

Garry's Mod
Shared: Physics · First-Person · Funny

A Story About My Uncle
Shared: First-Person · Adventure · 3D Platformer

Grand Theft Auto V Legacy
Shared: Action · First-Person · Adventure

Bulletstorm: Full Clip Edition
Shared: Action · First-Person · Adventure