Games like Retro Adventurer
Games like Retro Adventurer include SANABI, Super Meat Boy, Celeste, Sonic Superstars, and Trine 5: A Clockwork Conspiracy. We matched them by the tags players give Retro Adventurer on Steam (2D Platformer, Platformer, Action-Adventure, Action, and Strategy): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: 2D Platformer · Action · Adventure

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

Celeste
Shared: Platformer · 2D Platformer · Precision Platformer

Sonic Superstars
Shared: Platformer · 2D Platformer · Action

Trine 5: A Clockwork Conspiracy
Shared: Action · Platformer · Action-Adventure

Sonic Origins
Shared: 2D Platformer · Action · Platformer

The Messenger
Shared: Platformer · 2D · 2D Platformer

Blasphemous 2
Shared: 2D Platformer · Adventure · Platformer

Katana ZERO
Shared: Action · Platformer · 2D Platformer

VVVVVV
Shared: Platformer · 2D Platformer · Precision Platformer

I wanna be the Creator
Shared: Platformer · Action · Action-Adventure

F.I.S.T.: Forged In Shadow Torch
Shared: Platformer · Action · 2D Platformer

Pizza Tower
Shared: 2D Platformer · Platformer · Action

BlazBlue Entropy Effect
Shared: Action-Adventure · Action · Platformer

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

Downwell
Shared: Platformer · 2D Platformer · Action

Mina the Hollower
Shared: Action-Adventure · 2D Platformer · Platformer

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

ANTONBLAST
Shared: 2D Platformer · Action · 2D

Sonic Mania
Shared: Platformer · 2D · Action

Jump King
Shared: Platformer · Adventure · Action

Narita Boy
Shared: Action · Platformer · Adventure

Rusted Moss
Shared: Platformer · Action · 2D Platformer

Hollow Knight
Shared: Platformer · 2D · Adventure