Freaking loved the music. Is it dynamic? I think the chorals came only after some progression of the game.
The game is pretty and the gameplay is really nice. The overall ambience is on top!
I just think it is a little bit slow. Maybe speeding up the enemy scrolling could be interesting as we progress. Also, I think the frogs could appear a little bit sooner, in order to spice up the beginning a little.
Very nice overall!
Oh! and loved the chainsaw :p