The game is titled Legend of Titans. YouTuber Halbwurm went ahead and put together a few pics comparing Overwatch and its shamelessly obvious knockoff Legend of Titans:
Via: Halbwurm
Via: Halbwurm
Via: Halbwurm
Ripping off games is no doubt unbecoming, but in all fairness for a mobile game ripoff this is pretty impressive.