Excellent music, Excellent turn-based strategic gameplay, Excellent aesthetic, Excellent characters and charm, pure excellence in the form of a game. I've played Flash games on the Internet for over 10 years and this is one of the best of all time.
As of 4.0, this game has officially become P2W. If you haven't hit level 30 in at least one class prior to the update or you don't plan to spend $$$, you are at a clear disadvantage.
Good game, but it does nothing different from the previous titles. It has the same aesthetic, same 2D gunplay, same types of matches. Sequels are great, but this is nothing new for the series.