So...what's in the exclusive edition? It talks about skipping the intermission and nothing much else. And based on that, it sounds like it had less content than the public version (which, I don't think is the case but no other info is available in the page so...).
EDIT: Just got to the intermission. I do agree that skipping that could be a nice-to-have though not necessarily to spend money over unless you just want to support the dev (which I think what you're aiming for. Anyway, I just might buy the game once it has more content but it's going pretty well at the current state.