The first boss has a spot you can hide behind to keep attacking and it cant hit you! The second boss I knocked through the scenery and never saw him again and had to quit xD
I think the combat with the second boss needs to be tightened up a bit it seems completely random if he will be staggered or not when you hit him.
Overall I liked what I saw though the graphics style and music are really good and I would like to play more :)