I could be wrong, but I feel like there are more people like you that play a lower number of games for years than people like me, that play most big releases as they come out. It's a big reason why games are moving to the "live service" model, where they continually release updates for released games. Many people find a game or two they like and stick with them for years, so companies are trying to find the best way to monetize those types of players.
Tetris, Civilization, XCOM: UFO Defense, Elder Scrolls: Oblivion, Spelunky, Brogue, CDDA, and now Slay the Spire.
There have been a lot of other games, but those are the ones I've really played in my life. Others are pretty much relegated to 6 hours maximum, and that's just for games I really enjoy.
Also a big fan of Slay the Spire, I have about 200 hours in it. Another game I'd recommend is One Step From Eden, a hybrid deckbuilder and roguelike similar in a way to StS, but with a much more involved style of gameplay.
I find that it feels just as challenging (and satisfying) at my current ascension of 18 as it felt when I struggled to complete a run pre-ascension. Which is a remarkable achievement in game design.
I do wonder if me getting bored with it will occur at Ascension 20, Ascension 20 with Heart, or sooner.
