Insane!
Definitely the most fun one so far.
I actually like everything, from voice-acting and soundtrack to highly polished gameplay and graphic style up to different end-bosses and weapons.
The only thing is, that maybe the theme is not a perfect fit, but you did a real great job with this whole intro scene to also include it into the story.
Just few little points as feedback: For me the mouse sensitivity was a bit too much. It was somehow not really clear at the beginning, what the goal is... thought always i have to stand into the circles or so (until i noticed the countdown)... and the endboss/es in stage 3 are too crazy for me :-D
But something would be wrong, if that is not in Top 10 at the end. Awesome entry.