This is a nice way to pass the time, as a round lasts only 60 seconds.
On which exchange is the price based?
Yeah, maybe devs need to add this information, based on average market, or choosen from exchange?
Do you have any limits for wihtdrawl?
On the terms & condition section for limit deposits and withdrawal is 0.001 BTC. Deposites under limit will not be credited, maybe it's mean you are lost your BTC.
2. Fees, deposits and withdrawals
2.4.Deposits. The minimum deposit amounts 0.001BTC. Lower amounts will not get credited to your account.
We reserve the right to request proof of payments to the Account at any moment.
2.5. The minimum withdrawal amounts are 0.001BTC Bitcoin or altcoin equivalent. Lower amounts will not initiate a withdrawal transaction.