there is a new bitcoin casino opened daily,lets see what is on offer here....
"for cahsouts there is a low 1% cashout fee"- so you do not have a set tx fee? and a player that withdraws 1 btc will have to pay 0.01 fee?
it is too much,imho, as this effectively adds additional 1% house edge
"cashouts are almost instant,they ae paid every 5 minutes"-automatic cashouts is fine,but what is your security limit for manual withdrawals? 0.5 bitcoins 1 bitcoin?
"1% affiliate comission for every bet they make"-this is one of the most generous offers ,offer 1% total wgaered as affiliate??
 something is very wrong,most of the casinos ofer % of their house edge which is usually 1/10 of 1%
"md5 provably fair"-please,be more specific on how your games can be checked with a third party script

will wait for players who deposited and tried the promotion before commenting on that,but you could have offered a non deposit free spin bonus
to attract new players to your site instead
anyways,it is good to see more devs trying their hand at bitcoin casino business,good luck and hope your site becomes mega popular