If you read the walkthrough you will see what to do. (Not that it is much.) To start the game, use the hand on the wall (!).
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Hmmm...Windowed mode should be available through alt+enter, but that doesn't seem to work. The game is distributed without a setup file, which is annoying.
Anyway, to proceed from the title screen with all the characters, use the hand on the wall a little below the L in "GIRLS'". There is no sound, but at least some interaction. The gameplay seems to consist of choosing the correct doors, or else a killer will get you. Not much logic, just luck and memory the next time.