Games like Omega-Altro
Games like Omega-Altro include Hollow Knight: Silksong, Hollow Knight, Momodora: Reverie Under The Moonlight, Celeste, and Webbed. We matched them by the tags players give Omega-Altro on Steam (2D, 2D Platformer, Flight, Platformer, and Metroidvania): closest matches first, and among equally close ones the better-known games.

Hollow Knight: Silksong
Shared: Metroidvania · 2D · Platformer

Hollow Knight
Shared: Platformer · Metroidvania · 2D

Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Metroidvania · 2D

Celeste
Shared: 2D Platformer · Platformer · 2D

Webbed
Shared: 2D Platformer · 2D · Platformer

Rain World
Shared: 2D · Platformer · Exploration

Castlevania: Belmont's Curse
Shared: 2D Platformer · Metroidvania · Female Protagonist

SANABI
Shared: 2D Platformer · 2D · Pixel Graphics

Ori and the Will of the Wisps
Shared: Platformer · Metroidvania · Exploration

Constance
Shared: 2D · Platformer · Metroidvania

ANIMAL WELL
Shared: Metroidvania · Exploration · 2D

Afterimage
Shared: 2D Platformer · Metroidvania · Female Protagonist

Record of Lodoss War-Deedlit in Wonder Labyrinth-
Shared: 2D · Metroidvania · Female Protagonist

Nine Sols
Shared: 2D · Metroidvania · Platformer

The Messenger
Shared: Platformer · 2D · Metroidvania

MIO: Memories in Orbit
Shared: Metroidvania · Platformer · Exploration

Dead Cells
Shared: 2D · Metroidvania · Adventure

Öoo
Shared: 2D Platformer · Metroidvania · 2D

Touhou Luna Nights
Shared: Metroidvania · Platformer · Exploration

Iconoclasts
Shared: Metroidvania · Female Protagonist · 2D

Rogue Legacy 2
Shared: Platformer · Metroidvania · 2D

Timespinner
Shared: Metroidvania · 2D Platformer · Female Protagonist

Arzette: The Jewel of Faramore
Shared: 2D Platformer · Metroidvania · Platformer

ITORAH
Shared: 2D Platformer · Metroidvania · Female Protagonist