ASTRAL DISC is a project made by a team of game developers working a set of fanmade DELTARUNE Chapters 3-7, with Candleholder as a fangame in development, which you could consider a "Chapter 8".

There are no plans of making a fangame for Chapters 3-7 as of now, with our project consisting in a YouTube webseries format.

We hope all of this will interest you in some way!