How are you going to warrant among players that this site will not disappear anytime? I mean, there are so many short lived casinos, where you don't know if it will still be there the next time you visit. And any reason why you chose nano for this game?
Actually it does not matter if the site disappears or not,,, this game appears to be PVP so you just play, and you do not leave any of your deposits there. Simply play against each other, win or lose, you take everything out.
NANO is the interesting choice though.
This is a pvp game, so player needs to wait for other players to run one game. Perhaps this is the one is being asked by Twinkledoe, how if someone created a game but there is no one join it. It means that this player money is stuck on the website since it is a direct game method, once winner win then the winning money will be sent to the player's address. If there is no one join the game, how to refund the sent money?