Unique upcoming games (that you haven't heard about)

NYKRA. It will release on 27 Sep and was in development for about 8 years, I think.
This is an updated trailer from a week ago (it's newer than the store page right now).

Fashion Police Squad - https://store.steampowered.com/app/1319460/Fashion_Police_Squad/

Fashion Police Squad is a humorous Retro FPS where you fight against fashion crime using attire enhancing weaponry. Clean the streets of socks in sandals as Sergeant Des, and experience a single-player story full of fabulous characters, dazzling encounters, and fierce runway shows!

Looks wild. https://gfycat.com/equatorialsarcasticelephantseal-fashion-police-squad-gaming-fps

Zoelie

Release Date:
2 Aug, 2021
Developer:
Amanda Wood, Anushay Qureshi, Ben Brook, Bernardo Gullo, Brice Morgan, Collin Peck, Courtney Vogel, Dixon Dubow, Gabriel Tobias, Gianna Rockwell, Holly Owens, John Washington, Julia Myers, Julia Nguyen, Kellan Dwyer, Kelly Washington, Kuan Xue, Mackenzie Blackgoat, Maxwell Mecimore, Megan Tkac, Mercedes Khumnark, Michael Mauro, Mike Relleva, Nathaniel Cartwright, Nick Levene, Oscar Painvin, Phillip Corrado, Rachel Howard, Rodney Burton, Sanda Gavriliuc, Santiago Medrano, Stephanie Owens, Taan Tuchinda, Tiffanni Blevins, Tyler Klimek, Vincent Aliquo, Zach St. Amand, Zachary Taylor, Gage Leonard, Cal Eidson, Sammy Suen
Publisher:
Savannah College of Art and Design

Let's play video

My verdict: not bad for a free to play student project

Stumbled on this earlier today :)

Merek's Market

A chaotic crafting game about running a medieval shop. Take ownership of a small shop as you haggle, barter and craft your way through a comical single player campaign or team up with friends to supply the whole town.

ExeKiller - https://store.steampowered.com/app/1701840/ExeKiller/

Retro futuristic, single player, action adventure game with western vibes. You are a bounty hunter trying to survive in dystopian, post-apocalyptic world.

Reminds me a lot of 90s era cyberpunk adventure games.

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Not sure if it has been posted already, but here are some picks:
https://store.steampowered.com/app/1422420/ - dodgeball academia - sports rpg
https://store.steampowered.com/app/1062140/ - garden story - cute-looking arpg
https://store.steampowered.com/app/1140170/ - arietta of spirits - pixel graphics arpg

Not unique, but still https://store.steampowered.com/app/1454400/Cookie_Clicker/

I dunno about "Unique", but here's some upcoming games that look cool:

RIPOUT - Online Co-Op, Horror, FPS.
Survive with your trusty Pet Gun companion, collect loot, and customize your character to fit your playstyle.

Project MIKHAIL - Mecha, Action.
Project MIKHAIL lets you pilot a Tactical Surface Fighter in the war to save humanity!

Broken Roads - SRPG
Narrative-driven RPG that brings exploration, strategic turn-based combat and meaningful philosophical choices to an all-new Australian post-apocalyptic setting.

Omno is a great & beautiful puzzle adventure game.

The Artful Escape 🎶

I don't know how unique it is, but this one looks cool and I definitely had never heard of it:

https://store.steampowered.com/app/1330470/FIST_Forged_In_Shadow_Torch/

Oh, not to be forgotten : Webbed

Severed Steel

A stylish single-player FPS featuring a fluid stunt system, destructible voxel environments, loads of bullet time, a unique one-armed protagonist, and a dark electronic soundtrack.

P/S: Posted this a bit late - was planning to do it a few days ago but I forgot >.<