Nice!! Loved the rhythm and the colors. It's quite unique with its style and I really liked the gameplay addition that needs you to both hit the spheres with hands and slash the cubes with swords.
Relax and Adrenaline as you wish! I loved Brain Beats. I played it a bit and I love how the music is not grouped in Album but in Emotional/Mood categories.
You can pick between Relax, Energy or Adrenaline and you have different music tracks with higher BPMs depending on the choosen category.
You can also have an avarage value on the burnt calories for each track or you can make a playlist and see how many calories you'd burn for the whole playlist.
But what's most important is the whole idea behind the game that makes it different. You're not just playing for fun but also to have an emotional impact, and that's worked for me.