There'll always be a place for the opaque in gaming -- mysterious games that don't immediately express their intent with garish tutorial pop-ups and button-prompts. Jake Clover's Nuign Specter, a free experimental PC game, definitely falls into that category.
It'd be no fun for me to tell you what happens in the game; you really should just download it and give it a go for yourself. It's very cool, and all will be revealed as you play… more or less.
Nuign Specter [Freeindiegam.es]