Games like Rogueformer
Games like Rogueformer include Spelunky 2, Spelunky, Cuphead, Risk of Rain (2013), and The Binding of Isaac: Rebirth. We matched them by the tags players give Rogueformer on Steam (Platformer, 2D Platformer, Perma Death, Indie, and Difficult): closest matches first, and among equally close ones the better-known games.

Spelunky 2
Shared: Platformer · 2D Platformer · Perma Death

Spelunky
Shared: Platformer · Indie · Difficult

Cuphead
Shared: Platformer · Difficult · Co-op

Risk of Rain (2013)
Shared: Platformer · Indie · Perma Death

The Binding of Isaac: Rebirth
Shared: Indie · Difficult · Replay Value

Caveblazers
Shared: Platformer · 2D Platformer · Perma Death

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

Broforce
Shared: Platformer · Co-op · Indie

Celeste
Shared: Difficult · Platformer · Indie

BlazBlue Entropy Effect
Shared: Platformer · Replay Value · Action

Pizza Tower
Shared: 2D Platformer · Indie · Platformer

Skul: The Hero Slayer
Shared: Indie · Platformer · Action

The Binding of Isaac
Shared: Indie · Difficult · Replay Value

20XX
Shared: Platformer · 2D Platformer · Indie

Katana ZERO
Shared: Platformer · 2D Platformer · Indie

30XX
Shared: 2D Platformer · Platformer · Perma Death

BattleBlock Theater®
Shared: Platformer · Co-op · 2D Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · Difficult

Hollow Knight
Shared: Platformer · Difficult · Indie

Downwell
Shared: Platformer · Indie · 2D Platformer

Rogue Legacy 2
Shared: Platformer · Indie · Difficult

SANABI
Shared: 2D Platformer · Indie · Platformer

Bread & Fred
Shared: Co-op · 2D Platformer · Platformer

Noita
Shared: Difficult · Indie · Perma Death