Games like The Underground Man 2
Games like The Underground Man 2 include Rain World, Dungeon Munchies, Teenage Mutant Ninja Turtles: Shredder's Revenge, SANABI, and Skul: The Hero Slayer. We matched them by the tags players give The Underground Man 2 on Steam (Pixel Graphics, Post-apocalyptic, Side Scroller, Exploration, and Platformer): closest matches first, and among equally close ones the better-known games.

Rain World
Shared: Pixel Graphics · Exploration · Platformer

Dungeon Munchies
Shared: Pixel Graphics · Post-apocalyptic · Exploration

Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: Pixel Graphics · Side Scroller · Beat 'em up

SANABI
Shared: Pixel Graphics · Platformer · Action

Skul: The Hero Slayer
Shared: Pixel Graphics · Platformer · 2D

BlazBlue Entropy Effect
Shared: Pixel Graphics · Platformer · Post-apocalyptic

Broforce
Shared: Pixel Graphics · Platformer · Side Scroller

Shovel Knight: Treasure Trove
Shared: Pixel Graphics · Platformer · Side Scroller

HAAK
Shared: Pixel Graphics · Post-apocalyptic · Platformer

Touhou Luna Nights
Shared: Side Scroller · Exploration · Platformer

Terraria
Shared: Pixel Graphics · Exploration · 2D

Momodora: Reverie Under The Moonlight
Shared: Pixel Graphics · Side Scroller · Exploration

Deadlight
Shared: Post-apocalyptic · Platformer · Side Scroller

Hollow Knight
Shared: Platformer · Exploration · 2D

The Final Station
Shared: Pixel Graphics · Post-apocalyptic · 2D

Five Nights at Freddy's: Into the Pit
Shared: Pixel Graphics · Exploration · 2D

Reventure
Shared: Pixel Graphics · Platformer · Exploration

ANIMAL WELL
Shared: Pixel Graphics · Exploration · Platformer

Axiom Verge
Shared: Pixel Graphics · Platformer · Exploration

FEZ
Shared: Pixel Graphics · Platformer · Exploration

Rabi-Ribi
Shared: Pixel Graphics · Exploration · Side Scroller

Celeste
Shared: Pixel Graphics · Platformer · Indie

Gato Roboto
Shared: Pixel Graphics · Platformer · 2D

Sonic Mania
Shared: Pixel Graphics · Platformer · 2D