The idea is nice, the site looks ugly but I it is ok to start that way :-) I would say that the first thing to do is make an effort to build more trust in the visitor so you can have recurring visitors. So far I don't see any motivation to return to your site after the first visit.

The lottery is also a nice idea, but I think that you should implement it in a very cool way so it stands out of the tons of bitcoin gambling sites that appear each week.

Keep on working on that buddy!