where do i begin?
how about the logic portion.
"hmmm what's this big glowing thing? looks dangerous....maybe ill pop inside a moment and see what it does." does that sound like a healthy minded person to you?
he is a ninja right? ninja are pajama wearing panys that fight from the shadows. in other words.....that was more samuriesque than ninja.
the graphics were poor
your grasp of the english language needs work
your use of the know it all NPC was so abused it wasn't even funny. the dialog was lacking as well
and metal music doesn't always have to be put into a fight scene. nor emo music if that is where your next one is going.
i hope you use this information to better yourself as an artist.