Bonus forest levels are at this point, complete. I did also get to experiment a little with LUT shaders, that someone from my gamedev meetup introduced to me. They're quite interesting, unfortunately, the LUT filters can be very big files...I'm unsure if I will end up using them, but a small technical detail has prevented me from using them on the parallax backgrounds anyways because parallax backgrounds have no materials, and I can't use the "use parent" option to pass the materials from the root node.
Also, I have decided to move the code to gitlab. You can find it here: https://gitlab.com/beelzy/DiasporicCrypt
The old Github repo will be around as a mirror for awhile, but I'm removing it around the end of this year, so please follow developments on gitlab. If someone could edit the link in the first post to reflect that, that would be great. Unfortunately, I can't edit that post anymore, as it was probably made quite early on before Godotdevelopers got stable.