Not really a comment on the FX, but seeing as how you too the trouble to create a bit of suspense with the lead up and the music ...
you have a problem with "bloom" when you open the door (around 9 seconds). This is caused by auto exposure trying to compensate for the sudden change in light hitting the lens. Avoid this by switching to manual exposure and exposing for the critical elements in the shot.
Thanks for your comment. I don't have a camera with manual exposure.