Lawsuit? No chance ... roll with the punches and take what you get offered.
https://www.kickstarter.com/trust?ref=footer
"Creators are responsible for their projects. When you back a project, you’re trusting the creator to do a good job, so if you don’t know them personally or by reputation, do a little research first. Kickstarter doesn’t evaluate a project’s claims, resolve disputes, or offer refunds — backers decide what’s worth funding and what’s not."
"Some projects won’t go as planned. Even with a creator’s best efforts, a project may not work out the way everyone hopes. Kickstarter creators have a remarkable track record, but nothing’s guaranteed. Keep this in mind when you back a project."