Games like Quick Packer 2
Games like Quick Packer 2 include Totally Accurate Battle Simulator, Garry's Mod, Portal, BeamNG.drive, and Portal 2. We matched them by the tags players give Quick Packer 2 on Steam (Physics, Simulation, Singleplayer, Funny, and Puzzle): closest matches first, and among equally close ones the better-known games.

Totally Accurate Battle Simulator
Shared: Simulation · Funny · Physics

Garry's Mod
Shared: Physics · Sandbox · Funny

Portal
Shared: Puzzle · Singleplayer · Physics

BeamNG.drive
Shared: Simulation · Physics · Sandbox

Portal 2
Shared: Singleplayer · Puzzle · Funny

Poly Bridge
Shared: Physics · Simulation · Singleplayer

BONEWORKS
Shared: Physics · Singleplayer · Sandbox

Cooking Simulator
Shared: Simulation · Singleplayer · Physics

People Playground
Shared: Physics · Sandbox · Singleplayer

Goat Simulator
Shared: Simulation · Funny · Physics

Planet Coaster
Shared: Simulation · Singleplayer · Sandbox

Human Fall Flat
Shared: Funny · Physics · Puzzle

Teardown
Shared: Physics · Singleplayer · Sandbox

SuchArt: Creative Space
Shared: Simulation · Singleplayer · Physics

Hardspace: Shipbreaker
Shared: Simulation · Physics · Singleplayer

Total Tank Simulator
Shared: Simulation · Strategy · Sandbox

Crazy Machines 3
Shared: Simulation · Physics · Puzzle

Fun with Ragdolls: The Game
Shared: Physics · Simulation · Funny

Fireworks Mania - An Explosive Simulator
Shared: Singleplayer · Physics · Sandbox

Bridge Constructor Portal
Shared: Simulation · Physics · Puzzle

Planet Coaster 2
Shared: Simulation · Strategy · Singleplayer

Hot Dogs, Horseshoes & Hand Grenades
Shared: Physics · Simulation · Sandbox

Poly Bridge 2
Shared: Physics · Simulation · Puzzle

Kerbal Space Program
Shared: Simulation · Physics · Sandbox