I was absolutely creeped out the first couple times I heard this. I kept watching Lostlocked videos and it ended up stuck in my head and affected me in a negative way... I remember watching the first Lostlocked video and later I kept watching them but then realized it was scary... it was already too late though. I remember going into various different places and I kept thinking of the spooky skull.ogg theme. Beware any of those who do not like horror!
TL;DR I thought it was really spooky and did not like it... I prefer less scary music, although I see how people who like horror movies will react to this. The scariest music I have ever heard.