Wondering why you prefer to add chat first than the faucet
I think faucet is a must to dice site, faucet with leveling system will be greater.
And of course fast deposit and instant withdraw will always be most important thing.
But, I see on the image there are roulette and Cards. Are you going to provide three games in your site?
I think the faucet is not that important. You could as well skip it and just add some free coins to each new registered account, so the player can try the site out with some real cash.
Chat makes the site look more alive, so I'd go with that.
faucet isnt really an option here, some people like to "bingo" a dice sites by getting some satoshis from faucet and keepn on trying to hit the high multiplier, actually the sites could put in an unique feature like fastslot, where a new account got a starting of 10k satoshis if you register and 1k satoshis if you wish to play anonimously, alternative if you busted the 1k satoshis, you can reload it by opening a new tab to access the site
OP is asking about features, and I think regitration/sign-up bonus is not a feature.
I'd prefer to say sign-up bonus is a promotion rather than a feature.