Games like Mission XAM
Games like Mission XAM include Hollow Knight, Shovel Knight: Treasure Trove, Hollow Knight: Silksong, Super Meat Boy, and Cuphead. We matched them by the tags players give Mission XAM on Steam (Platformer, 2D, Retro, Action, and Difficult): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · 2D · Difficult

Shovel Knight: Treasure Trove
Shared: Platformer · Retro · 2D

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

Super Meat Boy
Shared: Platformer · Difficult · 2D

Cuphead
Shared: Platformer · Difficult · 2D

Celeste
Shared: Difficult · Platformer · Indie

Broforce
Shared: Action · 2D · Platformer

Geometry Dash
Shared: Difficult · 2D · Platformer

Pizza Tower
Shared: Platformer · Indie · 2D

Skul: The Hero Slayer
Shared: Action · 2D · Indie

The Messenger
Shared: Platformer · Retro · 2D

Sonic Mania
Shared: 2D · Platformer · Retro

SANABI
Shared: Action · 2D · Platformer

VVVVVV
Shared: Platformer · Indie · Retro

Jump King
Shared: Difficult · Platformer · 2D

Katana ZERO
Shared: Action · Platformer · 2D

Defy Gravity Extended
Shared: Platformer · 2D · Indie

Bloodstained: Curse of the Moon
Shared: Platformer · Action · Retro

Rain World
Shared: Difficult · Platformer · 2D

Out There Somewhere
Shared: Platformer · 2D · Indie

Angry Video Game Nerd Adventures
Shared: Platformer · Action · Difficult

Axiom Verge
Shared: Platformer · 2D · Indie

Volgarr the Viking
Shared: Platformer · Action · Difficult

BEEP
Shared: Platformer · 2D · Indie