Games like Parallel Self
Games like Parallel Self include SANABI, Katana ZERO, Hollow Knight, Broforce, and Momodora: Reverie Under The Moonlight. We matched them by the tags players give Parallel Self on Steam (Side Scroller, 2D Platformer, Action, Casual, and Souls-like): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Action · 2D Platformer · Story Rich

Katana ZERO
Shared: Action · 2D Platformer · Platformer

Hollow Knight
Shared: Souls-like · Platformer · 2D

Broforce
Shared: Action · Side Scroller · Platformer

Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Side Scroller · Souls-like

Anomaly Agent
Shared: Side Scroller · 2D Platformer · Souls-like

Celeste
Shared: 2D Platformer · Platformer · Pixel Graphics

Nine Sols
Shared: Souls-like · Action · Platformer

Skul: The Hero Slayer
Shared: Action · Side Scroller · 2D

Sonic Origins
Shared: 2D Platformer · Action · Casual

NINJA GAIDEN: Ragebound
Shared: Action · 2D Platformer · Side Scroller

pureya
Shared: Casual · Side Scroller · Arcade

Downwell
Shared: 2D Platformer · Action · Platformer

Super Meat Boy
Shared: 2D Platformer · Platformer · 2D

Gravity Circuit
Shared: Action · 2D Platformer · Platformer

Blasphemous 2
Shared: Souls-like · 2D Platformer · Side Scroller

Thomas Was Alone
Shared: Side Scroller · 2D Platformer · Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · Action · Side Scroller

Hollow Knight: Silksong
Shared: Souls-like · Platformer · 2D

Pizza Tower
Shared: 2D Platformer · Platformer · Action

Blasphemous
Shared: Souls-like · Action · 2D

Salt and Sanctuary
Shared: Souls-like · Action · 2D

Dino Run DX
Shared: Action · Side Scroller · Runner

Rogue Legacy 2
Shared: Action · Arcade · Platformer