How much does the Art Style really impact?

I showed 6 casual mobile hits to former Supercell Studio Game Artist and asked a crucial question everyone wants to know:

“Is there really something special in these games
In terms of game art and assets, or animations?”

These games are making millions of dollars,
Getting millions of downloads, but:

-> How much does the Art Style really impact?

I asked this to a close friend, also mobile game artist
Who worked many mobile game projects for years
under the Supercell Leadership.

Have a fantastic Sunday !

Cheers!