It was...unique...
Now, since you might be new, let me start by saying that something OVERLY original like this is a GREAT way for a fresh, blooming movie maker to get used to animation, voice acting, and the such.
But you might want us to fairly judge, so let me give you a run-down:
*The graphics were a little too bulky and hand-drawn looking, but, of course, this might have been the style you were aiming for...It doesn't quite fit well for a horror though. The 10-year old boy looked like a boy at first, but when hewalked inside the mansion, he looked like a miserable man with 5-o'clock shadow...and so did the girl...o.0 Not very descriptive, and too volatile of a change in your art style.
*The movie was a little TOO original, but, again, an all-original, simple movie is a great "self training video" for an animation-maker wannabe.
*The sound was a little off, and the voice acting was...well, unique...You sound like one of the characters from Fable! What kind of British is that, Western? Maybe it's not British, maybe it's something else...
*I know you intended this animation as a horror, and it was definitely apparent and all, but I can't HELP but give it SOME score in Humor--I mean, who DOESN'T find the annoying voice acting and the little old lady who eats heads kind of funny?
Overall, you did pretty good, if you're a beginner...if you're NOT new at this kind of stuff, well......