It's pretty interesting (and loaded quickly ;), and I like the sound effects. But the gameplay suffers a bit since the rules are a bit unclear. How does the player avoid failing? I always got bitten whether I was in the same room as the intruder or not.
The click to toggle the curtain seems to reset immediately (i.e. it opens/closes with each click). Is it supposed to remain closed to succeed? I tried clicking then pressing 's' and it _seemed_ to remain closed since there was no "opening" sound effect, though didn't prevent the inevitable. :)
And it was unclear when time passed. It seemed time only passed when you moved, but I found cases where I would do the recommended "hide in bed" yet the glass would break and the intruder would arrive and bite me anyway. (In an earlier play, I was able to get the washer down to 7 minutes after a lot of moves but it was still at 9 minutes after staying in bed the whole time.)