I finished Mouthwashing last night. It took me about 2.5 hours.
The intro segment made me think the tone was going to be a little lighter than it actually ended up being. (What I thought was a joke on the player was ultimately a key part of the story.) The horror gets somewhat meaner than I’d expected for playful ps1-looking game.
The sound design is impressive and I like the way the narrative jumps around and sometimes veers off into abstraction. Some of the puzzles took me a minute of wandering around but I was never stuck anywhere for long. In fact, sometimes the game simply advances unexpectedly and I think that helps keep things from getting stale.
Remember the part in the movie Eraserhead when you realize why it’s called Eraserhead? This game has a moment like that as well.