I think in order to receive feedback, it will be better to offer us some free spins.
In any way you have to include major cryptocurrencies like: Bitcoin, bch, ether, ripple, doge, ltc and others. On another hand if you add other altcoins, you will lose nothing but may benefit.
It will be good if you'll offer free spin on deposits (as I see currently you offer deposit bonus), also some slot tournaments would be nice where people have to wager and top ones will receive free spins as a reward. You can make both free and paid slot tournament.
Few months ago they offered no deposit bonus but it was not a real no deposit bonus as players are required to deposit in order to complete the wagering requirement because wagering from the no deposit bonus winnings does not count towards wagering requirement. I'm not really sure if they have changed their perspective about no deposit bonus, but if they have not changed it then free spins will be just the same IMO. Lets see what will they say about it, whether they will consider to offer free spins (normal free spins without deposit) or not.