That game got me to buy their music album back in 2005.
Yeah, I must admit I liked Polyphonic Spree too. There's a certain innocent quality to their work that seems to have disappeared in contemporary pop music. Makes me think of the the early Beatles combined with some early progressive rock groups (Jade Warrior, Camel? Dennis Greenslade?) with just a pinch of The Kinks thrown in for good measure.
Not cool. Not sophisticated. Maybe not even especially original.
But still an enjoyable group to listen to. There's even a hint of eye-candy up on stage. How can you go wrong?