Guns N Souls is a action runner collectable card game. You basically get to collect cards (which categorizes from three music categories) and use them to power up your character and fight monsters while running and shooting monsters along with dodging obstacles or traps. So after weeks of playing, I got bored with it because runner games is not really my interest. Although the big downside about the game is the lag. Anyway, the game is overall decent but is somewhat generic.
Conclusion: A decent runner action game.
Note: Available in the Japanese app store.