yeeeeee, one repost, one new, both are claimable:
https://itch.io/s/29936/lockdown-100-sale

Well, his/her email probably landed on spam lists from one of the leaks, but not from G2A, since I use unique Gmail alias and I never received spam from them!

Grass Cutter by usanik [Windows and Linux] [Ends on April 29th at 23:00H UTC+2]

• Grass Cutter is a game with rare and unique mechanics that requires logical thinking and quick reaction speeds. You have to mow the lawns at all the sites. At first it seems quite simple ... Right? But it's not! The game contains a real challenge that not every player can manage.
• Genre/Tags: Action, 8-Bit, Arcade, hard, meat, Monsters, old-school, pacman, reaction, snake, sokoban.
• Sale page: SPRING SALE 2020

View attached image.

Nightmare Cave by Triglaw: https://itch.io/s/29958/pay-what-you-want (claimable)

long day today it was <relieved>
asset, claimable: Launch sale! PS4 BUTTONS
game, claimable: Vogvhathos -Launch Sale

https://itch.io/s/29990/non-binary-dev-jam-sale claimable, game

(REPOST) Sheep with Mates: https://itch.io/s/29998/koningsdag-korting

(REPOST) Magical Cleanup Service: https://itch.io/s/30005/magical-cleanup-service-for-free

EDIT: Changed to -85%.

Annulus by TheOnlyQuarry [Windows?] [Ends on May 27th at 23:43H UTC+2]

• Warning: Demo.
• An action-adventure role playing game with metroidvania elements.
• Genre/Tags: Adventure, Action, Shooter, 2D, GameMaker, Metroidvania, Singleplayer.
• Sale page: Release sale!!!

View attached image.

SABER'S LIGHT, SWORD'S SHADOW (刀光剑影): https://itch.io/s/29496/100-off-sale-2020-2040

Trench2D by FiliBlaze: https://itch.io/s/30043/game-jam-spirit

EDIT: There is a bug. Claim it from the sale page or with this direct link (credits to compzone08 for this fix).
EDIT2: Bug fixed.

Lots of Martians by UEG Productions [Windows] [Ends on June 1st at 06:00H UTC+2]

• 5 Martians make it to Mars... One of them is sick. Can you colonize Mars with a plague going around?
• Genre/Tags: Simulation, Survival, 2D, Endless, Singleplayer, Space.
• Status: Maybe a beta. In development.
• Sale page: Lots of Martians Quarantine Sale

View attached image.

The Door Game : https://adnroy.itch.io/the-door-game

Fooking Bird by CxrloDev [Unknown OS] [Ends on May 30th at 00:00H UTC+2]

• Note: Published recently. The RAR contains an Unity game.
• Genre/Tags: Platformer, 2D, Flappy Bird.
• Sale page: COVID-19 SALE

View attached image.

Pixel Tanks by SebBainsDev [Windows and macOS] [Ends on May 3rd at 00:59H UTC+2]

• A crazy 3 player-One Keyboard Shoot Off!
• Genre/Tags: Action, Fighting, 16-bit, 2D, Arcade, Multiplayer, Pixel Art, Retro, Shoot 'Em Up, Top-Down, Unity.
• Sale page: 3 Player for Free!

View attached image.

REDASTERIOD by IGALSTUDIOS [Windows and macOS] [Ends on December 31st 2020 at 19:59H UTC]

• Now you can colonize mars! send your rocket and start the adventure!
• Genre/Tags: Adventure, Simulation, Alternate History, City Builder, Historical.
• Sale page: "FIRST ASTRONAUT ON MARS!"

View attached image.

Hamster Run by blitzargames [Windows] [Ends on May 14th at 08:00H UTC+2]

• Hamster Run is not your average runner. This thrilling adventure puts you at the controls of our hamster hero as you jump, slide and blast your way through exciting, fast paced courses.
• Genre/Tags: Action, 3D, Arcade, Colorful, Cute, Endless, Fantasy, Fast-Paced, infinite-runner, jumping, Singleplayer.
• Sale page: Hamster Run -- FREE!

View attached image.

Meditation 5 by Thunder Perfect Witchcraft [Windows and Linux] [Ends on May 3rd at 23:59H UTC+2]

• A minimalist game about balance, concentration and strategy inspired by Taoist philosophy. The goal is to prevent the screen from turning red by shooting abstract enemies with two crosshairs simultaniously.
• Genre/Tags: Shooter, Action, 2D, Abstract, Arcade, gamepad, High Score, Minimalist, On-Rails Shooter, psychedelic, Twin Stick Shooter.
• Sale page: Meditation 5 - Free Weekend

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Collection Quest by namelessdev [Windows] [Ends on May 2nd at 07:00H UTC+2]

• Collection Quest is a story-driven RPG collectathon with an emphasis on the role-play and story. You will have to immerse yourself into the games world in order to progress and unravel the mysteries it holds. Venture forth, engage with its denizens and leave no stone unturned. Adventure Awaits!
• Genre/Tags: Adventure, 2D, collectathon, Controller, godot, Pixel Art, Story Rich.
• Sale page: Collection Quest Early Launch Special

View attached image.

EDIT: One of the upcoming sales posted by buszmen201 in a past comment

Kalling Kingdom by Elega Corporation [Windows] [Ends on June 1st at 07:00H UTC+2]

• In this fantasy themed, turn-based city simulation game, players will need to use their wits to see it through to the end! Your citizens will look to your leadership when successful, or they may abandon the town when you make massive mistakes. The choice is yours.
• Genre/Tags: Strategy, Simulation, 2D, City Builder, Economy, Fantasy, Relaxing, Turn-based, Turn-based Strategy.
• Sale page: Social Distancing Special

View attached image.

⇩ DOWNLOAD ONLY

EDIT: Changed to download only. Author added a Browser only game and changed the sale modifier to -50%, then -97% and later -100%. And checking the comments in both games, author is begging for money.

SideLeague (totally not a ripoff of Rocket League) by Palvazar [Windows and Browser] [Ends on May 31st at 09:00H UTC+2]

• Wvat: A 2 player game made to play in the same keyboard. Even if the tag says 3D is a 2D game. At least it's worth it to try the Browser version once.
• Genre/Tags: Sports, Racing, 3D, cars, firstgame, fun, Multiplayer, Soccer.
• Sale page: SideLeague

View attached image.

Plokoth : https://samrassy.itch.io/plokoth

EDIT: Author deleted the RAR file, so it's now a Browser only game.

HELP WANTED by Palvazar [Windows, Linux and macOS] [Ends on May 12th at 09:00H UTC+2]

• WARNING: From the creator of [SideLeague] and [Crimson Dawn Demo], there is a high chance that the end date won't be honored.
• Genre/Tags: Platformer, 2D, Runner, simple, Singleplayer.
• Sale page: HELP WANTED

View attached image.

View attached image.

SHORT SALE

Pichon! by Crimson Ghost Games [Windows and Linux] [Ends on May 3rd at 13:00H UTC+2]

• A puzzle platformer where you play as a chubby bird that's constantly bouncing. Fast reflex and good timing will allow you to sort obstacles, activate secret passages and collect the necessary gems to be able to open the door at the end of each level.
• Genre/Tags: Platformer, Action, 2D, indie, Puzzle-Platformer, Retro.
• Sale page: finde night

View attached image.

⇩ DOWNLOAD ONLY

EDIT: There is a bug. Claim it from the sale page or with this direct link (credits to compzone08 for this fix).
EDIT2: Bug fixed.
EDIT3: Sale shortened by 1 day.

Hellver by hamsal [Windows] [Ends on May 11th at 09:00H UTC+2]

• Delve into the depths of hell and slay hordes of enemies on your way down through a dark well in this retro inspired rouge-lite FPS.
• Genre/Tags: Shooter, Action, Difficult, Fast-Paced, FPS, Horror, Procedural Generation, Roguelite, Singleplayer, upgrades, Violent.
• Sale page: Free Week

View attached image.

Make Your Love by mishada [Unknown OS] [Ends on May 8th at 21:00H UTC+2]

• Warning: Game language is russian (not checked if it has other languages).
• Genre/Tags: Visual Novel, Cute, Funny, Minimalist, relationship, Romance.
• Sale page: Бесплатная раздача

View attached image.