It is okay
It is nice that you put more effort into a Clock Day flash than a lot of other people did. It was cool to include that description because that is really all you need to know about it. At first, I thought you were going to use the Boo guys from the Mario games. It's cool how you used the legendary Missingno from the pokemon games. For those of you who do not know, Missingno is not a pokemon, but a glitch in the system. That by itself is a pretty haunting feeling.
It was a pretty appropriate choice of music as it did turn out to be spooky. I am going to assume that this simply never ends. The background was nice and it did work well as an experimental flash. I do, however, usually want more in a submission so next time you could just put in some more action and stuff. It is pretty spooky at first, but does get repetitive as you kind of want more to happen.