Here's the Repulsar! This guy shoots out beams that are powered by the music. If the beams hit you your ship will be pushed away. The more powerful the music, the greater the repulsive force.

However, as all forces have an equal and opposite reaction, you can also use this against the ship to push him back too. A useful tactic if used in the right way.

These guys can be hard to handle in packs when there's other enemies around and space is tight.

Here's a new teaser image of a new boss turret type: The Tractor Beam. These are powered by the music and will reach out and grab you if you get too close! The more powerful the music the further they can reach.
Note the players ship has had a makeover too.