You have too much tiny text. Your signup form is not distinctive. Even adding a class of "bg-success" to your div with the id of "signup-form" (that will give it a greenish background) would be somewhat helpful. Spend some time reading http://getbootstrap.com and you'd be surprised how much you better you will get in a few hours once you understand which classes are available to you. It has a lot of decorator classes that will transform your colorless UI instantly.

Since you provided no test user credentials and I am not willing to skew your metrics by registering, I can't evaluate how the site functions for a registered user.

You featured a blog post very prominently and wrote it in a self-deprecating style. While I appreciate the creativity, that does not help in increasing conversions.

My biggest concern

I am not sensing product direction besides your innovative mailbox that filters by intent. This feels like "I wanted to try building a dating website and didn't think about a unique hook".

I agree that traditional dating sites have abysmal messaging. This can be a good hook.