Good job.
This is quite nice, i like it how the man gets a little "surprise", hehe.
This gave me a little scare. I'd suggest you keep the horror somewhat paranormal/something of the sort.
Anyways- This was done quite well. Judging by that footpring on door, someone already tried to get out by kicking the door, which must've been locked. and since the windows are nailed with boards, there is no escape, so the main character naturally hides in the bathroom.
Graphics:The graphics were awesome, i'll give you 8/10 on that.
Audio: The audio was appropriate, helping the atmosphere.
Except you could work on that radio. Add some shout/weeping between the static. :D
Interactivity:Well, i guess all that we really need is play/replay button, and there are links to previous parts. 6/10
Humor:Didn't find anything funny. (cuz it's not supposed to be, i guess xP) 0/10
Overall: Good job, keep up the good work! 7/10