Games like Super Onion Boy 2

Games like Super Onion Boy 2 include SANABI, Shovel Knight: Treasure Trove, Celeste, Super Meat Boy, and Sonic Origins. We matched them by the tags players give Super Onion Boy 2 on Steam (Adventure, 2D Platformer, Action, Retro, and 2D): closest matches first, and among equally close ones the better-known games.