Hello! Apologies for not responding to this message until now! I don't think I'll be updating Infinite Underworld, but I would love to make a sequel to it someday, although maybe without the Kid Icarus brand due to copyright. I really like a lot of your ideas, and adding more replayability via things like adding more enemies and items to make runs more diverse would definitely be a goal for a potential sequel . Something like including the Credit Card I think would be a good fit considering the game focuses a lot on shops. And also your idea for adding in the small challenge rooms like the original Kid Icarus was something I considered but didn't end up adding. They most likely would have taken the form of horizontal areas similar to the surface areas or dungeons of the original games.