So, I got some games from the sale and slowly started playing them a little...
Slay the Spire seems to be quite liked, but it's not really my thing. Beat the game with three of the four characters I have access to and it still hasn't really "clicked". If somebody could explain to me what makes this game so (supposedly) great, maybe I'd be able to appreciate it a little better?
I also got Redout 2, because I really enjoyed the first part and thought the second should be at least as good. So far I like it, seems like a graphics upgrade and some gameplay enhancements from the first part. However, with ai assist disabled, the difficulty curve seems to be brutally steep. Also, even though I have only played like 8 tutorials and 3 campaign tracks so far, I have already had some issues with clipping through the course after jumps, which might turn into a rather annoying trait if it remains an issue. Still, would recommend. It's a beautiful antigravity racer with terrific "car" mechanics.
Apart from that, I got the gog version of Sid Meier's Alpha Centauri running (although the videos don't work). It's kind of my comfort game which I keep returning to.
Regarding StS, I think you've given it a fair shot if you've completed it with three characters already. If you still want to press on, then I found the fourth character really fun and engaging. I didn't try that many difficulty levels (think I made it to 4 with the Ironclad), but I really liked the daily challenge as well to mix it up and quickly feel powerful in my runs.
I always think of Slay the Spire as my gateway drug into other deckbuilding games such as Monster train and Griftlands, so if you've enjoyed the card aspect of it, maybe give one of those a shot? (Or stay clear of them if you hated that part)