I'm kind of in the same boat as you as far as the ST. I like it very much, but I think I've decided to sell mine. I just don't use it that often.
Given that, my favorite games are the remake of Star Raiders, Buggy Boy, and Lemmings. I need to try more. And maybe we can do that here....play some "new-to-us" games together before I sell mine. Every time I play games on the ST, I find it to be very reminiscent of the Sega Genesis. There must be some connection in the hardware. The games just have that same look-and-feel of Genesis. Maybe it's just me.
My ST has a GoTek drive in it, meaning I'm completely dependent on images. And I have a bunch.
I also have a small collection of commercial games on disk. But since I don't have a working floppy drive anymore, they are useless to me.