Games like Exit Plan
Games like Exit Plan include Gang Beasts, Climber Animals: Together, Garry's Mod, Portal, and Party Animals. We matched them by the tags players give Exit Plan on Steam (Action, Party Game, Casual, Physics, and Stylized): closest matches first, and among equally close ones the better-known games.

Gang Beasts
Shared: Action · Physics · Casual

Climber Animals: Together
Shared: Party Game · Physics · Casual

Garry's Mod
Shared: Physics · Casual · Building

Portal
Shared: 3D Platformer · Puzzle Platformer · Physics

Party Animals
Shared: Casual · Party Game · Action

ALTF4
Shared: Physics · Action · 3D Platformer

Tricky Towers
Shared: Party Game · Physics · Casual

Chained Together
Shared: Casual · Platformer · Puzzle Platformer

s&box
Shared: Action · Casual · Building

Refunct
Shared: 3D Platformer · Casual · Puzzle Platformer

Goat Simulator
Shared: Physics · Casual · Action

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Action · Casual · 3D Platformer

Human Fall Flat
Shared: Physics · Action · Puzzle Platformer

Portal 2
Shared: Platformer · Puzzle Platformer · 3D Platformer

Machine Party
Shared: Party Game · Casual · Physics

Kill It With Fire
Shared: Action · Physics · Casual

Donut County
Shared: Casual · Physics · Indie

Bomb Rush Cyberfunk
Shared: Action · 3D Platformer · Stylized

Fun with Ragdolls: The Game
Shared: Physics · Action · Building

Rubber Bandits
Shared: Party Game · Action · Casual

Clustertruck
Shared: Action · 3D Platformer · Physics

Pumpkin Jack
Shared: Action · 3D Platformer · Third Person

Placid Plastic Duck Simulator
Shared: Physics · Casual · 3D

MECCHA CHAMELEON
Shared: Party Game · Casual · Funny