Hi!
I am working on a sequel, yes. There is a playable demo available but bear in mind it is very early-stage which is why it is locked behind a password. You can try it via my blog (the password is in the linked post).
If you want to keep up with the game's development, you can follow my blog, though I know not everyone has or wants to have a Tumblr account; I'll probably be setting up a newsletter by the end of the year.
Thanks for playing Arcadie: Second-Born by the way, I hope you'll enjoy the sequel! ;)