Wow. That's a hard question to answer without giving spoilers - but I will try my best.

The mood changes based on the choices you make. I always feel this overall sense of seriousness because choices do matter. Sometimes it's funny, sometimes it's serious, sometimes it gives you a good scare jolt, and sometimes it's very gory.

I'm not big on gore, but it isn't gore for gore-fest sake.

I'd suggest playing the demo, but they've taken it down.

I'm picky on my horror media, and this is one of my favorites.