Games like ReX
Games like ReX include SANABI, Broforce, Celeste, Shovel Knight: Treasure Trove, and Katana ZERO. We matched them by the tags players give ReX on Steam (Casual, Action, Adventure, Indie, and Platformer): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Action · Adventure · Pixel Graphics

Broforce
Shared: Action · 2D · Platformer

Celeste
Shared: Indie · Platformer · Pixel Graphics

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

Katana ZERO
Shared: Action · Platformer · Indie

Sonic Origins
Shared: Action · Adventure · Casual

Out There Somewhere
Shared: Platformer · Indie · Adventure

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

BEEP
Shared: Indie · Adventure · Platformer

Super Meat Boy
Shared: Platformer · Indie · 2D

Hollow Knight
Shared: Platformer · Indie · 2D

UFO 50
Shared: Indie · Action · 2D

Axiom Verge
Shared: Indie · Action · Platformer

VVVVVV
Shared: Indie · Platformer · Pixel Graphics

Pizza Tower
Shared: Indie · 2D Platformer · Platformer

Downwell
Shared: Indie · Platformer · Action

The Messenger
Shared: Platformer · Action · 2D

Gato Roboto
Shared: Action · Indie · Adventure

Jump King
Shared: Indie · Adventure · Action

Zombotron
Shared: Action · Adventure · Indie

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

Minimalism
Shared: Casual · Action · Indie

Cyberhunt
Shared: Action · Casual · Indie

MO:Astray
Shared: Action · Indie · Adventure