PCG does exactly what I used to do here. I'm not going to repeat what they are doing. I'm just looking for interesting looking games out of the thousands not mentioned. But I've decided to differentiate this post by saying that all the games have to have demos.
store.steampowered.com
Releases May 5: Everything trendy rolled into one: An auto-battler rougelike deckbuilder.
store.steampowered.com
Releases May 5: Honestly, I don't know what this is. It looks like a Tetris tile city builder with combat and card collecting
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Releases May 5: Grand Strategy RTS
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Releases May 6: Pirate hack and slash
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Releasing May 7: Roguelite, deck building, base building. You run a haunted house and try to kill the humans
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Releasing May 8: Third-person ARPG
store.steampowered.com
Releasing May 8:Base building RTS
Coming Soon with Demos:

Gods vs Horrors on Steam
A drafting roguelike focused on synergies, scaling, and positioning. Recruit Gods from different mythologies, buff and upgrade them, arrange them in perfect formation, and defend the Earth from cosmic horrors!

Drop Duchy on Steam
Build your duchy piece by piece in this refreshing hybrid rogue-lite game. Use block-dropping mechanics to collect resources, recruit troops to fight against belligerent armies, and let every block shape your realm, leading your path to victory!

Knights of the Crusades on Steam
Travel to the Holy Land with the First Crusades. Rise from a humble knight to the founding father of a world-spanning holy order. Lead through war, faith, diplomacy, and cunning schemes. Experience a unique blend of RTS, city-building, and sandbox gameplay, and shape history!

Captain Blood on Steam
Captain Blood is a pirate-themed action game where you play as a fearsome pirate seeking gold and glory. Expect adventures with cannon firing, pistol shooting, swashbuckling sword fights, and plenty of pirate shenanigans. This hack'n'slash features fierce combat, hordes of enemies and flashy combos.

Deck of Haunts on Steam
Deck of Haunts invites you to become a malevolent Haunted House. Lure humans into your cursed halls, manipulate their fears, and drain their essence to grow your power. Use strategy to build your mansion and expand your dark influence, turning your home into a terrifying, inescapable nightmare.

Empyreal on Steam
Empyreal is a complex, challenging, feature-rich action RPG. In a far-flung corner of the galaxy an Expedition arrives on a hitherto unexplored planet to find a colossal Monolith built by a lost civilisation.

Darfall on Steam
Darfall is a hero-based RPG city-building game that puts you in the role of a hero who must protect their home and help it grow! During the day, grow your hero’s might, find epic loot, master new abilities, and fortify your settlement. At night, survive the hordes of undead, until you triumph.