Games like Radical Rex
Games like Radical Rex include Sonic Mania, Shovel Knight: Treasure Trove, Sonic Origins, Broforce, and SANABI. We matched them by the tags players give Radical Rex on Steam (Action, Adventure, Platformer, Retro, and Dinosaurs): closest matches first, and among equally close ones the better-known games.

Sonic Mania
Shared: Platformer · Retro · 2D

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

Sonic Origins
Shared: Action · Adventure · Retro

Broforce
Shared: Action · Platformer · 2D

SANABI
Shared: Action · Adventure · 2D

Sonic Adventure DX
Shared: Platformer · Adventure · Action

Rayman® Legends
Shared: Adventure · Platformer · Action

DuckTales: Remastered
Shared: Adventure · Platformer · Action

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

Dust: An Elysian Tail
Shared: Action · Platformer · Adventure

Out There Somewhere
Shared: Platformer · Adventure · Action

Commander Keen
Shared: Platformer · Action · Retro

Ori and the Will of the Wisps
Shared: Platformer · Action · Adventure

The Messenger
Shared: Platformer · Retro · Action

Hollow Knight
Shared: Platformer · 2D · Adventure

Turok
Shared: Action · Adventure · Dinosaurs

Tomb Raider I (1996)
Shared: Action · Adventure · Platformer

Narita Boy
Shared: Action · Adventure · Retro

Sonic Adventure 2
Shared: Action · Platformer · Adventure

Dead Cells
Shared: Adventure · 2D · Platformer

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

Wonder Boy: The Dragon's Trap
Shared: Adventure · Action · Platformer

Oddworld: Abe's Oddysee®
Shared: Adventure · Platformer · 2D

Castlevania Anniversary Collection
Shared: Action · Adventure · Platformer