I have ran into a few ideas for games, and thought it would be nice to have them united under one DataStore, or one game with multiple places you can enter without needing to get teleported from a lobby, and that is mostly because some people take a while to connect (and can have a good chance at failing to connect) or the teleport service fails to work at a good rate.
The idea would be to allow a non-start place in a universe to be able to be active, show on your profile, and have a play button that does not re-direct you to the start place like the old games page was. This would solve the issue of having a DataStore that goes across games you own, without needing one via the HttpService.
Edit:
Something else that can be done is trans-gaming (doing stuff in one game affects the other), like currencies and stuff like that.