Okay a nice game. Just like what I played when I was a kid.
But do you have only one batch of it?
I mean what if there are 160 players? So there will be like 10 batches of this right?
Or first come, first serve and only 16 players can gamble?
There is only one round of 16 bets at the same time. (You can bet on several values in one lot). The games are very fast with a large number of players. And since the game is fully automated, winnings to winners are sent immediately after the end of the round.
This is just my opinion that 7% commission looks quite high for the service you provide for each round.
Maybe for the first few days, you may run some promotions like reduce the minimum amount of bet to 0.001BTC and provide first few people one-time free amount 0.001 BTC then you get more players to the site. If people like the game then they may continue playing with their money.
Also, for the first few days either you reduce your house edge or remove completely.