Fun game - got through to the third boss battle before I had to give up because there was a bit too much clicking for me. I like the way it uses the same mechanics in the dungeons and in the boss battles but they feel different. The dungeon sections feel like you are mowing down hordes of enemies whereas the boss battles are more about surviving the bullet hell.
The fire power was my favourite (before it got taken away)- feels powerful and the enemies exploding into their coloured pixels is a nice touch.