Have you played it?
I have. It's not the solution at this stage of development. Even in the final months before release, a playable version is one thing that actually can generate bad publicity, because most people want to play finished games and don't have the enthusiasm, patience or emotional control to judge alpha/beta versions sensibly.
For the Kickstarter, the game needs to be sold by showing as much good potential as possible, while showing as few imperfections as possible. Open access achieves almost the opposite of this.