It's not unique, but the closest I could find isn't that good.

The stanley parable was literally one big secret when it was first released, but now the steam guides changed all that. :|

A comedy point-and-click game with a semi-omniscient narrator who hates everything about the game, the point and click genre, and the UI, with the gameplay usually consisting of fourth-wall-breaking moments (I.E. "This room is very, very dark. You're going to have to find a torch. Yes. Definitely need a torch. No way to get past without one. There aren't any brightness settings in the options menu. Nope. Not being sarcastic. Not at all. Seriously. No way to continue without a torch, especially using the brightness menu. Oh. Are you ignoring me? Wait, are you ignoring me, or is the volume muted? CAN YOU HEAR ME? Huh. No response. That means you can't hear me. Unless you don't have a mic. Wait. Does this game support mics? Uh, how should I tell you to turn on the volume? Turn on the volume. I probably wasn't loud enough, I'd better shout. TURN ON THE VOLUME SO YOU CAN HEAR ME! Oh. I guess shouting won't help- if the volume's on you can't hear me."

An FPS game designed from the ground up to be played primarily using projectile weapons, with a health system based on the SSBB games (if you get knocked into specific parts of the map, you lose).

A game about abusing glitches to complete the game in the wrong order, with the wrong items, faster than normal.

A game where you control a sawblade. Yes. A sawblade platformer. I said that.

If anyone wants to make these, contact me- I am definitely interested in cooperating to make these. It's too bad my pixel art and specific game design details are bad or I'd try making them myself.