Remove 1 letter from a game title and provide a new synopsis.

Gran Theft Auto - Grannies stealing mobility scooters and robbing bingo halls.
Project Ars - 3d butt creation software.
Alf-Life - Experience the daily life of shop assistant Alf Freeman, brother of Gordon Freeman.
Shower With Your Ad Simulator - Businessmen have to use showers sposored by their adverts.

Rack N Run - You have a nice rack now its time to RUN! New slow motion feature! (Rack N Ruin)

E.T's Nom - You have phoned home and now you're hungry. (Retsnom)

I'm laughing too hard at Final Fantas to think of anything

Antsquad - A group of mercenary ants sell their services to the highest bidder.
Back to Ed - Domestic violence simulator (sorry!)
The Banner Sag - Banners all over town are starting to peel, it's your job to put them back up!
A Bid Story - An Auction Simulator

Zombie Arm Trilogy

System sock - a mans quest to find matching socks.

Project ARS(e) xD

Don't Stare - A man finds himself naked in the wilderness and encounters the embarrassment received
Alien Warm - You are comforted by a group of aliens whom save you from the cold
Plane Explorers - The findings of a group of airplane crash investigators
T.A.L.K.E.R.: Clear Sky - A group sociable people discuss the weather
LIMB - A young boy has to sacrifice his leg to find his sister

Orderlands - You must keep your retail website operational, while remaining profitable and keeping up with orders. Beware the holiday buying season!

Hype Fighters - It's your job to quell the enthusiasm of the masses.

Rayon Chronicles - Is it about the fabric of space-time itself? No. It's... it's about fabric. Just fabric.

DECON - A game about killing bad rats.

Just Case - It's the trial of the century. Play as either the defense attorney or the prosecutor.

Earless Fantasy - Navigate a simulated real world without the benefit of sound.

Ma Payne - You play as the matriarch of a crime family.

Orbital Gar - It's a game about a giant space fish.

Lice: Madness Returns - You've got lice... AGAIN! Can you get rid of the lice before time runs out and the damage to your social life drives you insane?

BiShock - You have to tell your parents you're bisexual without giving them a heart attack.

Gun Moneys - Play as either an arms dealer or the government agent trying to shut them down.

Free To Pay - A Steam movie about micro-transactions and pay-to-win games.

Tomb Rider - You play as a necrophiliac trying not to get caught in the act.

Fallout: New Vega - War. War never changes. But at least you've got a vintage Chevy in which to traverse the post-apocalyptic wasteland.

Vanguard Princes - Rule 63 is in full effect.

The Wither - An unholy force is making everything rot and die. Can you stop it?

Saints Ow - An educational religious game where you experience the martyrdom of various saints from a first person perspective.

Freedom Plane - Fly your way to freedom!

Castle Rashers - It's a game about eating bacon in medieval times. Try not to get trichinosis. And don't get caught stealing your feudal lord's pigs!

Guacamelee! Old Edition - Now enjoy this popular game with genuine CGA graphics!

Gunpint - The liquor store robbery simulator.

Sakura Licker - Um... you figure it out.

The Ultimate DOM - Find out how the other half lives. Deluxe edition comes with a motion sensitive "riding crop" controller (requires 2 AAA batteries, not included).

In Urgency - Driving simulation game where you absolutely have to be on time! Scenarios include "Pizza Delivery," "Ambulence Driver," "You Should Have Gone Before We Left!," "Late For Your Own Funeral," and more!

Ero Siege - An erotic adventure like no other.

The EGO Movie - Videogame - Licensed tie-in for the Marvel Cinematic Universe movie about Ego, the Living Planet.

Adventures of Huggy - The exploits of jive-talking bar operator and police informant, Huggy Bear, from Starsky and Hutch.

English Country Tun - A retro indie game where you have to constantly jump over wine barrels or dodge falling casks of ale.

Everlasting Sumer - You're the ruler of your own little slice of Mesopotamia. Can you ensure your kingdom will last through the ages?

Sugar Cub: Bittersweet Factory - You play as a gummy bear trying to rescue your friends and escape the candy factory, before you are all packaged and sold. Will you make it to Big Rock Candy Mountain, or end up in the sterile aisles of a Mega Mart?

Alien Rag - Unlimited - In this fish out of water game, you're just a wayward human trying to run a tabloid newspaper in a busy space station near Alpha Centauri. Can you figure out what stories the public wants to read, when most aren't even your species?

Boop

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I Have No Moth, And I Must Scream - Go on an epic quest to find your missing pet-moth, fueled by angst and rage all you can do is SCREAM!

Pankiller - You are the Pankiller, the scourge of all chefs whom you battle for the control of all kitchens, with your trusty pan!

The Witcher 3: The WIld Hut - Follow this man in search for a hut to rest.

EDIT: Forget it, someone already did it. I hate this game. I don't need this game.

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Cash Dive -

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To the Moo - A Cow adventure

Arksiders - play as the architect of the Noah's Ark.

Tar Wars: Battlefront - EA's poorly received response to Splatoon
Ad Rats: The Rat's Revenge - Just updated with new F2P model

Bad ATs - Star Wars mechanic simulator.

Of Orcs and Me
Ales from the Borderlands
The Walking Dad: 400 Days (Damn, that's some walk)

Itcher 3 - Itch yourself to death!

Aster Than Light

Feeling the Aster.

Arm 3 - The realistic tactical arm simulator
Orderlands - The kitchen is about to open. Do you know what you want to eat?

Oat Simulator - Be an oat

Ok I give up

Borderlads: a game about young men trying to migrate illegally.
Universe Sadbox: sounds like a game about my room.
SORE: not sure what's that about, but sounds NSFW.
Rim Dawn: it's about a girl named Dawn, you play as her boyfriend and you have to... well.. never mind.
Licker Heroes: probably a sequel to the previous one.
Dad Bits: no comment.
BiShock: your goal is to chill down your parents after coming out of closet about your sexual orientation.
Emily Wants To Lay: another NSFW game.

Bionic Commando: Reamed - Bionic Commando's enemies get their sweet revenge in this 18+ spinoff

Borderlads - Follow the story of a group of fine young men seeking to cross the border to reach Sanctuary. (Borderlands)
The Sis 3 - It's like Super Mario Bros except it's with sisters. And it's the third game. (The Sims 3)
TEA - Join a merry group of adventurers as they set out to slay evil... after tea time, of course. (TERA)
Maia II - The second installment in the game series where you play as the daughter of Atlas. (Mafia II)
BioSock Infinite - Nobody believe the mad scientist Dr. Dewitt when he claimed that he could bring life to socks. (BioShock Infinite)
Left 4 Dad 2 - A young woman seeks out to find her father who went missing one day, after a pills overdose. (Left 4 Dead 2)
Half-Lie 2 - A depressed scientist decides to only speak when he is about to say a half-lie. (Half-Life 2)
Sniper Lite V2 - It's the mobile version. AKA, it sucks. (Sniper Elite V2)
Screenchat - It's literally just a chat. (Screencheat)
Driftmoo - Racing game with... cows! (Driftmoon)
Call of Juarez Gunsinger - A broke cowboy tries to make money by singing in saloons. (Call of Juarez Gunslinger)
No More Rom in Hell - CD-ROM are so evil that even the devil himself banished them from hell. (No More Room in Hell)
The Waking Dead - Oh shit, that one actually works both ways. (The Walking Dead)
LIMO - Ever dreamed of driving a limo? Now you can! (LIMBO)
Oat Simulator - Now on Steam Greenlight! Vote for it to get a free key! (Goat Simulator)
Floating Pint - If you see a floating pint, then you probably had one pint too many... (Floating Point)