Pretty much everything is explained in the image, but I'm adding a note: I already had in mind the overall shape of the letters while working on Avenue of Lost Tales, but it wasn't until later that I decided to come up with an actual alphabet. So while the scribblings in Avenue of Lost Tales resemble these letters, they don't actually have any sense at all.
Font pack link:[link]
As I explain better in the guide included in the pack, I looked into OpenType but didn't find a simple solution to line implementation. Maybe a combination of features would have done the trick, but I'm no coder or font maker so I opted for 7 (yep, seven, sorry guys) fonts that must be combined inside the text block to implement lines. This is very tricky and tiresome I know... Remember though that I never meant this to be a common use font, but just a little decyphering game inside my future works instead.
You're welcome to use these symbols in your works if you want, and you can modify and improve them too. In both cases, just please reference me, thank you ^^