Hi Shuze,
I took a look at your Kickstarter page and I agree with what other people are saying. It look like you have a cool product with an app that gives a lot of useful information. I don't think I've seen any smart power bars like this yet!
Your rewards are sort confusing though, and even though your page is well-designed and appealing to look at, it does have a lot going on.
I would maybe focus less on calculating extra pledges in the rewards sections. You can have an add-ons or stretch goals section in your main text and contact backers about their options and the survey once they have pledged. It would just make it easier to know what they are getting at the level they are currently pledging at.
I also don't think your campaign shows how the different colors will look, which I think is important if people are going to pay to upgrade to a different color.
Good luck with your launch, let us know how things go!