Starr Mazer is not a real game and that makes me sad and you should be sad, too. This video was put together by the snazzy folks at Imagos Films. This trailer—for a non-product—has some good bullet hell action, sure, but the cutscenes and point-and-click adventure elements really sew things together.
It was actually developed as an in-movie commercial for indie film maker Don Thacker's Motivational Growth. I would play the heck out of some Starr Mazer, though.