It's just Hotline Miami, but nobody can really hurt you and you fail if you don't kill someone who finds a body or you fast enough. The issue is, the game has Hotline Miami's ranking system almost down to being a copy. You're rank is based on time and score, the latter increased by rapidly killing or destroying corpses. The problem is, the UI is all built like it wants you to be slow and methodical, using shadows and stealth. The worst offender though is the special weapon they give you for the final level... which will literally kill you or make you fail more than your boring old knife.

Story is just Silent Night, Deadly Knight.