Well done. I am a full blown amateur when it comes to film making so do what you want with my input. I am an expert on horror movies though.
I like your edits and choice of camera angle for the most part. A couple of suggestions:
The shot where the viewer brifly gets xray vision to look through the stall door and then moves to a hot inside the stall seems a bit cheesey. I would rather keep getting closer to the door and then cut to a shot that makes it look like you’ve simply traveled through the door – I didn’t care for teh xray vision.
When she is being dragged underneath the stall: I like it – I thought it was a little different than the victim being dragged into the stall as you see in many films. However, I would show her being dragged and make the last thing the viewer sees is her disappearing under the door – then show the clouds over the school etc. Showing her after she is dragged under the door and laying on the floor is redundant for me and removing it would tighten it up a bit.
I was pretty impressed with the acting form the children – I know it was a brief part for them, but they did a great job.
I thought it looked great. I thought you created a good amount of mood to it.