For my part, I haven't gotten anything new yet, so if you've read my recommendations before, I apologize for any repeats. Roguelike Edition, apparently.
PlateUp! is my favorite couch coop game on Steam. You and up to three friends work together to run a restaurant. It's a little like Overcooked, but instead of having different wacky levels to get through, you choose a menu (starting with one dish), and build up your restaurant day after day. Every few days you will have to choose a new complication (like another dish or reduced customer patience). The goal is to get through 15 days of service without a single dissatisfied customer, so it's like a restaurant roguelike. It's currently 70% off and 94% Positive all time.
Dead Cells is a very fun sidescrolling roguelike that feels a bit like a Metroidvania. Collect weapons, kill monsters, die, repeat. It's currently 50% off and Overwhelmingly Positive all time.
FTL: Faster Than Light is a classic roguelike at this point. You must traverse the different sectors of the galaxy to reach and destroy the Rebel Flagship. You can order crew members around in real time, while the ship weapons take time to recharge, giving a turn-based feel. It's 70% off and Overwhelmingly Positive all time.
Noita is an amazing roguelike as well. You play a wizard attempting to explore down into the earth for treasure. Every pixel in the game is made out of a material, from plain old Dirt to flammable Oil to useful Water. Find treasure and new magic wands. Mix and match the spells on your wands to make new effects -- and even utterly broken bullshit. It's 60% off and Overwhelmingly Positive all time.
What about you? What do you recommend?
Some DLCs are "worth" getting, others are not.
Utopia more or less always gets recommended, as do a few like Apocalypse, Federations, Machine Age, Leviathans, Distant Stars, and possibly Ancient Relics.
The others are a mix of "adds some fun stuff" like Grand Archive, Nemesis, and some of the species packs, to "outright avoid" such as Cosmic Storms which is so disliked it's the polar opposite to Utopia in terms of recommendations.
That all said if you know where to look you can play them all for free anyway, often the same day new expansions are released, so you don't end up paying to the complete mess that is post expansion patches, broken mods, and wasted time when you keep having to restart because something either wipes out a core part of your empire in a change, stops working, or simply bricks your saves.
I know where to look and have played them all which is why just buying the original game without the dlcs, all of them, isnt good enough for me.