Nice app. One thing I did see that you might want to add is some examples. I know it's a simple contact form, but some people will want to see how it looks before signing up. You can include a few different examples.

Edit: After 5-10 minutes, I JUST noticed the email me button at the bottom of the page. I think if you moved the button slightly to the left, so that there is a gap between the button and the side of the page, it will help with visibility. I think my issue was, the button being in that corner it didn't catch my eye, or look out of place enough for my eyes to look there. If it's not touching the side of the page, I think it looks more out of place (I don't mean this as a bad thing) causing people to see it sooner.

Looks great though, congrats on 4000+ users!