Check out @jacob_c 's list at https://games-gallery.jacobcarpenter.com/all-time for a gallery, it shows the threads tagged “game” ranked by the likes count of the first post.
Note that the gallery only shows the first-posted versions of games, so it may be worth checking the forum links for newer updates. For example (shameless self promotion), the latest versions of Space Rocks 3D and Boulders and Gems have a lot more features and bugfixes compared to the initial ones.