Frankly from my experience, Flash has been great for two types of games - RPG's and Point n' Clicks. With series from the former like Sonny, Mardek, Murloc, and Sinjid. Out of all of those though, the one with the best gameplay, art, and music is easily this series. While the gameplay is mostly the same to those games mentioned before, the standout feature in this entry is swappable party members mid battle and summons. Not to mention an overworld that in design trumps all of them, with weapons and useful items found throughout if you look hard enough.
As for the art, it just keeps getting better, with everything beautifully made and mixed well. but the music? The music is some of the best Flash could hope to offer. All the battle tracks are amazing, most of the overworld tracks are bangers. And the boss themes? Absolutely perfect. If you're looking for a good RPG, this game is better than a lot of what's on the market now.