Whatever your project is, make sure you price backer rewards at levels that make potential backers confident that you strongly believe in your own success.
I failed to do this with my Keyglove project, and it really showed. It was obvious enough that someone actually called me out on it, prompting me to cut the backer reward prices in half, after which time I saw a significant increase in support, ultimately meeting the fundraising goal in time.
If you price your rewards in such a way that you're hedging your bets against failure by dumping the risk on backers, that kind of doubt is both obvious and contagious. Kickstarter is not meant to be an insurance plan, but rather a way to find people who believe in your product as much as you do and will support it accordingly. If you don't wholeheartedly believe in your own project, then why are you working on it? And if you do, then there is no need to skimp on backer rewards.