Aside from the very simple design which is not attractive, there is also a big missing thing in this site. It is about the provably fair system, I cant find anything related to how the coinflip works which should be the most important thing in this kind of game. Without provably fair system, there is a high chance for cheating attempt.
The available games to be joined seems to be made by the admin to attract users but it wont work. I believe no one will spend their money on a non provably fair coinflip game.
One more thing, fee for instant withdrawal is so high (1000bits = 100k satoshi).
As you know, I am working on my own on this site. The 1000 bits withdraw fee is actually too high too, as I can easily lower it to 150 bits.
When a game gets started, the system uses a small and easy code to determine what the winning side will be. By using this code;
if (rand(1,2) == 1) { $win = "heads"; } else { $win = "tails"; }
As I said, I tried to keep this site as simple as possible. I will be working on the looks of the site. And I am thinking about lowering the fees per bet (or add a referral system where you receive a % of what the person you referred wins.