If they're going to use Future Pinball to demo the layout of the game, it should at least be complete and playable. I could knock out a FP layout like that in an afternoon. Adding art, coding it and making it fun? That's a whole different story.
When I worked in film I saw a lot of guys create similar premature Kickstarters. Most were trying to fund a movie before they had a script, or they tried to work the idea of not having a script into the charm of the production. Others asked for too little money, ensuring the sweat off their back would make up for a higher budget. Unless true geniuses were at the helm, none of the above ever worked out.
It also rubs me the wrong way that the Kickstarter lists "The Engineer" and "The Producer" before the positions we really care about as potential investors in a pinball: the designer(s), the artist(s), the musician(s) and the programmer(s). That, along with "Vonnie D" plastered across everything possible makes the whole endeavor seem very ego-driven...not pinball-driven.
I agree with those who have suggested slowing down, putting something more cohesive and air-tight together, and coming back strong with a second attempt. We're not going to hate you for making sure it's done right.