I noticed that there is no registration button and it says at the bottom of the page that "login by linking your solona wallet". would you mind further explaining how your website works?
also, if the website does not accept bitcoin, it would be more appropriate if the thread is moved to the altcoin board.
You will connect your wallet with the platform. Each time you bet- if you lose, your fund from your address will be sent to house and if you win, your address will receive fund. That's how it works I think.
Regarding BTC issue, since OP said it's on Solana, only token built on Solana blockchain can be used for playing. If there's any wrapped bitcoin on Solana, OP can add that option too.
I actually don't really like gambling sites that automatically link directly to my wallet. Apart from only 1 layer of potential, of course, it will be much more vulnerable. However, to visit the new site, then we might be able to use a fresh new wallet and enter some Solana balance just to make a deposit at the casino and try playing for a while to find out how comfortable we are made to bet in it. Because this is quite new, so it seems that this is a way for us as gamblers to prioritize the balance in the wallet that is not easily linked directly to the casino.
2 to 3 layers of transactions are also quite good. For me personally, this is still new, and can't make us sure to bet. For beginners who want to try, wait for the signup bonus that the OP said will be released soon or maybe you can use the referral link.