I back KS board games, but never video games. I'm not sure I could explain why, but I just recoil against the idea of backing a KS video game.
That said, I also don't really understand the logic behind shutting down a KS before it reaches its natural end-date. Many, many KS projects reach their funding goals in the last 24 hours, even when they seemed out of reach just days before. And even if they are certain they will fall short, letting a project run its full funding period on KS has no down-side, right? At the very least, it gives them a better idea of the interest level.