Lemmy is very much a viable alternative
Oh, how I wish that were true. Alas, stats keep showing that Lemmy is not continuing to grow, on the contrary. There is close to zero activity in anything but the most main stream communities and Lemmy is only now making very, very slow and tentative steps to actually surface more niche communities after effectively burying and suffocating them in every release up to and including the current stable.
Another vote for the untitled goose game. My kids loved that one at just about any age.