Glad you’re excited, I am too! but keep in mind this is quite a large amount of work (check out the Paper2D source for size ideas) and I don’t have the support of the Epic team around me to solve some more involved issues I’m coming across as I’m doing the implementation.
So I can assure you I’m chipping away at this as fast as I can, but it is all going to take a while 
tbh if you have a game idea you are eager to get started with, I’d start prototyping in Paper2D or alternative engine and then you can evaluate Sissor2D on its release and see if you want to make the switch.