Things that would have made Amnesia scarier

[gandalf91]

Monsters that never disappear and then start patrolling a pre-determined area if they give up looking for you. I felt too comfortable just going in a dark corner when the music changed and then walk around again when the safe-music came on again and I knew they had vanished forever. But letting them roam free too much would risk them blocking the only exit with their bad AI.

I agree wholeheartedly. I would also like to add that the music in this case should only last so long...as to cast uncertainty. Music stops, shouldn't necessarily mean it's really gone...