It contains vertical-scrolling rhythm gameplay which is most notably found in games like Guitar Hero, but in multiplayer. But that's not all that it offers!
There is the Edoren System which spices things up by allowing you to do special attacks, making each round slightly different from the previous.

You can choose between a distinct cast of anime characters ranging from the stoic half-spider "KneoX" to the calm violinist "Shiroko", each with their own variety of special moves giving the rhythm gameplay a strategic twist!

You can also make your own custom song charts and play them with your friends! (you're gonna have to buy the Legion DLC first though)

The Features Of Rhythm Brawl :-

• Vertical Scrolling Rhythm Gameplay.
  
• 2-5 Minute Long Battles.
  
• Local Multiplayer.
  
• AI Battles.
  
• 6 characters, each with their own playstyle.
  
• Many different songs from different music genres.
  
• Edoren System for strategy.