https://store.steampowered.com/app/1075080/Falcon_Age/ 70% off, historical low
https://store.steampowered.com/app/1195410/Trial_of_the_Gods_Siralim_CCG/ Siralim CCG 66% off

https://store.steampowered.com/app/262060/Darkest_Dungeon/ 85% off <Bundle with all dlc's is 78% off>

https://store.steampowered.com/app/916730/Gato_Roboto/ 50% off

https://store.steampowered.com/app/391540/Undertale/ 70% off (I think I never saw this game at such a low price)

https://store.steampowered.com/app/1229380/Everhood/ 25% off <Not the lowest price>

https://store.steampowered.com/app/599140/Graveyard_Keeper/ 75% off

https://store.steampowered.com/app/683320/GRIS/ 75% off <Pretty sure it's the lowest price yet>

https://store.steampowered.com/app/253230/A_Hat_in_Time/ 50% off

https://store.steampowered.com/app/1222690/Dragon_Age_Inquisition/ 88% off

Is there any any way to filter games that are at least -75% off?

If you own Ori and the Blind Forest, you can get Ori and the Will of the Wisps 10% cheaper than the asking price, making it historical low

https://store.steampowered.com/bundle/18725/Ori_The_Collection/

Disco Elysium is with that Control upfuck the most useless completion bundle....

It shows 16,19€
in cart: 26,98€

Japanese School Life

https://store.steampowered.com/app/555640/Japanese_School_Life/

Now - Historical low : 90% off - 0,99€

Previous historical low was 80% off.

It´s a voiced visual novel.

https://store.steampowered.com/app/47790/Medal_of_Honor/ 85% off.

Kona is an awesome and underrated game. At that price people should grab it.

Thanks for Mirror's Edge Catalyst at -90 %, finish the first one a couple of month ago and at this price this is a still :)
Also found that : https://store.steampowered.com/app/899390/Xenon_Racer/ 90% off
https://store.steampowered.com/app/928840/Cybarian_The_Time_Travelling_Warrior/ 90% off

Nothing that screamed must-buy on my wishlist, shame.

https://store.steampowered.com/app/1049280/Pilgrims/ -60% (HL)
https://store.steampowered.com/bundle/22071/Creepy_Tale_Bundle/ -50.5% (HL)
https://store.steampowered.com/app/256290/Child_of_Light/ -70% (HL-ish, was free on JoyBuggy and Ubisoft)
https://store.steampowered.com/app/260230/Valiant_Hearts_The_Great_War__Soldats_Inconnus__Mmoires_de_la_Grande_Guerre/ -75% (HL)

choice/monthly:

https://store.steampowered.com/app/393190/TSIOQUE/ -45%
https://store.steampowered.com/app/714120/Little_Misfortune/ -65% (HL)

bundled before, but still worth mentioning:

https://store.steampowered.com/app/695050/Rain_of_Reflections_Set_Free/ -90% (HL)
https://store.steampowered.com/app/421120/Samorost_3/ -80% (HL)
https://store.steampowered.com/app/576500/Evergarden/ -80% (HL)
https://store.steampowered.com/bundle/1662/PopCap_Party_Pack/ -86.35% (HL)
https://store.steampowered.com/app/600370/Paradigm/ -72%
https://store.steampowered.com/app/629770/Tiny_Echo/ -75%
https://store.steampowered.com/app/269710/Tumblestone/ -90%
https://store.steampowered.com/app/484920/Full_Game_Upgrade/ -90% (cheaper, for trial keys or something)

Child of Light and Vailant Hearts are even cheaper in a bundle:
https://store.steampowered.com/bundle/5585/Arcade_Bundle/

Tomb Raider series and other Eidos/Square Enix games are again at or near HL, worth checking. Most of them is slightly cheaper on GreenManGaming, but there you won't get winter cards, ehh...

https://store.steampowered.com/bundle/2925/The_Zachtronics_Puzzle_Pack/ -62% (HL as has more titles than before)

AUTOMOBILISTA ULTIMATE EDITION (-82%)
https://store.steampowered.com/bundle/12010/Automobilista_Ultimate_Edition/

Thank you so much! I really appreciate it!

The new badge is ugly until level 9 IMO.

Frictional Collection -87%

Bladed Fury -75% historical low~

https://store.steampowered.com/app/677300/Ghosts_of_Miami/ (90% off, HL)
https://store.steampowered.com/app/1432220/GI_Joe_Operation_Blackout/ (75% off, HL)
https://store.steampowered.com/app/1422090/Sink_Again/ (85% off, HL)
https://store.steampowered.com/app/378610/Valley/ (90% off, HL)

https://store.steampowered.com/app/703080/Planet_Zoo/ -75% off, both the base game and the Deluxe edition
https://store.steampowered.com/app/413150/Stardew_Valley/ -30% off
https://store.steampowered.com/app/587450/Saurian/ -50% off
https://store.steampowered.com/app/1244460/Jurassic_World_Evolution_2/ -30% off, both the base game and the Deluxe edition

Ultreïa -80%

https://store.steampowered.com/app/774361/Blasphemous/ - 75% It's slightly cheaper if you own Bloodstained: Ritual of the Night and then buy The Sword and Whip Bundle.
https://store.steampowered.com/app/274520/Darkwood/ - 70% The base price was lowered recently, I think. So it's really cheap. It was also announced there would be a 1.4 update coming soon. Though no date confirmed yet.
https://store.steampowered.com/app/47810/Dragon_Age_Origins__Ultimate_Edition/ - 84%

There are some games i thinking to buy, among those, here are some, but ill wait with purchases until 4th Januar to see if any of the games i planning to purchase ends up on January choice or not:

https://store.steampowered.com/app/914020/Gibbous___A_Cthulhu_Adventure/
new historical low, -80%

https://store.steampowered.com/app/907470/IrisFall/
new historical low -75%

https://store.steampowered.com/app/826940/Maid_of_Sker/
new historical low -60%

https://store.steampowered.com/app/1361320/The_Room_4_Old_Sins/
new historical low -40%

https://store.steampowered.com/app/761830/Mr_Prepper/
new historical low -27% but this will be clearly cheaper by time... the ~12€ still not that bad already.
however, if you own the Endzone which is in current choice then only 10,41€ in a complete your collection bundle.

there are more i thinking to buy, but none of them on new historical low, just on repeat historical low or some slightly cheaper on other stores, like GMG, Fanatical etc.

Very rare discount from Cotton Game developer.
https://store.steampowered.com/curator/41206640