Pretty good
I wish i could run it on high though, the graphics are very well drawn and would look so good....
anyway, the music was amazing and the quality of the animation was stunning, but the visual "gap" between missions was really apparent.... the zombie stage was pretty lackluster while the robot stage had you freakin travel through time! also, the the lack of enemy variation got kind of irritating... especially when the backgrounds look identical. its just a bit too repeditive at some parts.
honestly my favorite part was the opener in the beginning