I think it would be great having an achievement system, and depending on the difficulty of the achievement you get a reward.
Like for example: Clear CC150 (achievement). -You get an item from cash shop, which will be decided for the developers-
Of course you only get that item 1st time you clear the floor or do w/e needs to be done to get the acievement. You can create more harder or grindest achievements (retaking same example), clearing idk 100 times that floor and the reward will be better.
I know it will take time to create such a system, but, what do you think?
But would be nice to see as something further down the road after open beta is released ;3
