Not bad..I really like the boss levels!
ok, so it doesn't have the best graphics.....so what? the voice acting , sounds and music are very good, the gameplay is fun, and the boss levels are great! there many kinds of enemies and the backgrounds are nice( even with the "weak" graphics, that in my opinion is getting better from level to level).
One thing that bothers me is the fact that the enemies reappear when you go back even after you kill them. the backgrounds are nice, and most of the foe are nice too, but try harder on the character appearance.....
p.s. : for those of you who think its so easy....stop playing on "EASY".....