Hi Crabada team,
Just realised my kid playing the similar game like crabada in web 2.0 called dragon city. It has 100M download in play store, so crabada i believe will has a same shot.
Here's my suggestion:
  1. Create free to play as well, where there is free character to play. (but cannot earn reward, only play)
  2. Do not limit 6 times play per day. Make it unlimited. but the mining more than 6 no need to get reward
Hope you guys take a look. cheers
#snibsnib