if it's gonna cost anything, that is

He make a Friday Night Funkin Engine called Kade Engine.

Will it be open source and are mods gonna be supported ?

So, Average4k will be able to import most files for other arrow-based rhythm games, correct? is there a full list of everything that works? i've tried stepmania and i can confirm that works, but i'm just curious.

An open beta would be pretty cool, and will give us a feel of how the notes will be, and how it will be played out