Heya, kali, great story. you really set a great halloween atmosphere to the whole story, very strange and mysterious. you write action and fighting scenes very well, keeping the action going.
if you ever decide to edit this story, i'd prolong the suspense a bit, when the turtles find themselves in strange places. take a little more time to describe the setting. i don't know if you're planning on explaining what actually happened, or if you left the story unresolved on purpose. in any case, the writing is great. i'm very impressed.