Welcome to the bitcointalk community. I usually do not use any new gambling site. But it seems to me that your service is something interesting. So, I am interested to know about the 20% deposit bonus of you. What is the terms of accessing this 20% deposit bonus. Hope, you will give a proper response regarding this.
have you tried checking their section regarding bonuses -
https://www.coinslotty.com/bonus-terms or this
https://www.coinslotty.com/bonuses ? you can also tap the read more if you want more info pertaining to their specific bonus promo.