Saying that this and megaman battle network are the same is just saying megaman and megaman x are the same.
Well, the first thing that called my attention was the battle system, you could only move left and right, that actually is lame and made me not want to play the game at first look, but then if you try it a bit you gonna see that is better than it seems, basically the commands are easy and if you cant avoid, well defend it with your shield (Y button). The special attacks are used through cards in a deck and you can set favorite cards to be used anytime when they appear during battles.
The bosses are kinda interesting, well their name specially is a constelation name along with something else, like taurusfire, this boss is basically a cow with fire elemental attacks, pretty simple eh? but it gets off the same (insert name here) + man names.
The sound itself well, its nothing special, really, nothing that makes you want to hear it loud, but yet is not quite bad.
The bro system is actually a quite handsome idea, basically you can have your own brothers (people that form a brotherband with you), you can exchange email through the game (needs wifi connection) and brothers can give you bonuses and a special brother power in battle, basically the brother power will randomly turn into any of your brother favorite cards during battle.