Not too sure if a lot of you have played this yet. But there's a Clock Tower-esque flash game called Darkness. Complete with a horror premise, panic button, and a Jennifer Simpson-lookalike! It's a very spooky game, there's a lot of jump scenes here. And sound is a definite must in order to create the atmosphere. Here are walkthroughs to Darkness 1 and Darkness 2.
Also just in case, I made a Clock Tower Ratings Community. Join it if you're curious as to what CT character do people see you as.: