From what I learned by reading this project, it's better to support project with about 100$*(if you want to play with your friends, it's theoricaly 20$/person) before 7 feb, so you will receive core game in september this year and twice as much bonus content(like new class, new enemies, new objectives, rooms etc) in april next year for free.
I'm going to support them, gotta show it to my friends and ask them for shared budget for that

*You need to donate at least 100$ to receive basic edition and you need to pay additional few $ for delivery.