At the time, flash games were very popular, so it is not surprising that Mika Mobile would choose a simple and elegant art style that reminded people of those flash games that were popular at the turn of the 2010s. Battle Heart had great animations, timed perfectly that you really believed those were attacks, and the simple storytelling with describing the areas was perfect.
Battleheart, the birth of the series, was a good game. It was very fun because it was easy to pickup, some basic configuration, and lots of class mashups to create amazing stuff. Still, it’s very linear storytelling, and improper algorithms putting some characters at disadvantages took away from the greatness of this game.