The homepage could use a lot of work. There's nothing
wrong with it now, as a hacker project, but for something that's soliciting money, there's no indication of that on the homepage, no explicit illustration of what the value prop is, or any reasons listed why it's something I dhould pay for (or really, even that I have to pay at all).
You could probably fix that with a $15 ThemeForest theme (to make it look less like an abandoned open source project and more like an actual product) and some A/B tested copy.
You need a lot more copy on the homepage. Figure out what the answers are to the questions I asked above and plaster those on the homepage. Why should I buy this? How much does it cost? If you can take some nice pictures of it in action, that's even better.
If you're selling a service, you need to actually sell the service. It's harder than just saying "Here's this thing, buy it", which is basically what you're doing now.
On the whole, the project is intriguing, and though I'm not a Pebble user, I could see value in being able to speak directly to it. Who is your market? Pebble users? Or sites that want to target Pebble users? I don't know that from the copy on the website.