I have a few ideas for future games, but I don't plan on making a sequel. Nuinui Quest is my first game and while I'd love to create new Mega Man/X/Zero-inspired games now that I have a bit more experience, I also want to explore other genres. I think it will depend on the success of this upcoming release, because I don't mind making similar titles if that's what players clearly want! :'D
(It's only sold on Steam because that's the only option for releasing a game under holo Indie at the moment, not much I can do about it)