Here are some rankings from the top-grossing charts:
1 Germany, Canada , Switzerland, UK, France, Spain, Netherlands, USA, Austria, Denmark, Norway, Ecuador, Belgium, Mexico, Brazil, Austria, Chile, Hong Kong, Costa Rica, Colombia, Peru
2 Australia, Sweden (behind Spotify), Italy
3 Taiwan, Finland, Argentina
4 New Zealand, Bahrain, Poland
5 Ireland
6 Japan, Thailand, India, Indonesia
8 Singapore, Oman, Greece
9 Kuwait
10 South Africa
11 Vietnam
13 Croatia, Pakistan, Portugal, Philippines
16 UAE
20 Russia
22 Azerbaijan, Egypt
27 Saudi Arabia
31 Ukraine
33 Israel
58 Malaysia
71 Turkey
It's the top free app in all of the countries listed above. But clearly, not everyone is buying. In Venezuela it's the top free App but it's no where to be seen in the top grossing charts lol
The game isn't released in iOS biggest market yet, China. Korea is absent too.
Don't read much into the rankings, I am certainly not, I am waiting for the Japanese chart to update. It debuted at 6, it will be interesting to see where it will go from there, since Japan is the top smartphone game market.