I had plans for a sequel like that but I burned out on making Touhou fangames after doing only those for like 2 years... so right now it's postponed while I work on my own IPs for a bit. (My main project Burgertale is basically a kitchen sink of every metroidvania I've ever made so hopefully you'll enjoy it when it's done - I can't legally put Touhou characters in it but I have plans to sneak in a few subtle references ;P)