Shout Out / An SMWC Production

• Craggy Heights from World 2 has a lot of enemies from Super Paper Mario.
• Tutankoopa is the boss of World 6.
• Multiple levels, specifically "Football Canyon" and "Oh Man! It's Hell" contain themes and enemies from Cave Story.
• You get to ride Squawks the Parrot in one of the castles.
• Judging on how often music from this game is played, you can tell that someone's a fan of Touhou Project.