There are literally thousands, thanks to Steam and the work on Proton. I recently made the leap from Windows to Linux as my daily driver, for the first time ever, after using Windows on my PCs since 3.1.
Out of the roughly ten games I was playing regularly in Windows when I switched, there isn’t a single one that’s unplayable. The only one I’m still struggling with is Dyson Sphere Program but that’s because they hard coded the E key and I can’t use autohotkey to work around that anymore (I’m a ESDF guy, not WASD). The game itself runs fine.