Your dex needs a lot of improvement. You need to get your own domain first so you can operate. Someone who isn't aware of github might think of your dex as not a legit exchange.
You need to lessen the minimum trade for DAI. It's a dex so it should be more adopting than the cex so lessening the minimum is needed. What does the mail method means?
Thanks for the feedback. There is no intent to move it to a centralized domain name / hosting as the hope is that users of the protocol run the site from their own localhost server. If they do that, it makes it more difficult to censor the protocol.
There is no minimum trade size to use the protocol. What you are referring to is an open offer to buy DAI using fiat. Anyone can create an open offer of any trade amount. The mail method on that offer means the desire to send fiat by mail in exchange for DAI.