Oozing with style and character, Killer7 should be the first thing that pops up on searches for "arthouse games". It's story can be pretty obtuse but that I find that adds to it's charm. The voice acting is also great

Too heavy handed for its own good. When leaks of this came out of this the pictures of the mc with "I hate myself" written on her face didn't exactly scream subtle, and this final game has basically lived up to that. But its short, doesn't out stay its welcome and can be quite scary in parts. Also free