I’ve used Minigalaxy on a couple of older laptops, and it’s one of those tools that “just works” without pulling in a ton of dependencies. The interface is bare-bones, but that’s exactly why I like it install, update, play, and nothing extra running in the background. It handles DRM-free titles really well, and I’ve rarely had issues with downloads or launching games, even on lightweight distros.
If you mainly stick to GOG and don’t need all the Galaxy features, it’s honestly a solid choice. The only thing to keep in mind is that some games still need manual tweaks, but that comes with Linux gaming in general.