For the past few weeks I have been working on Enhance [0], a SaaS to help game developers easily add leaderboards, friendlists, store players' data, in-app currency store and purchases, and marketing tools such as email list and website builder and hosting.
I am almost done with the landing page and don't think I'll put much more into it, and will continue working on the API itself. But I still plan on adding a playable game into the 3D scene just for the sake of it and to learn. But so far I'm struggling at projecting a 3D camera render to a texture inside an already existing 3D context.
[0] https://the-project-e609e.web.app/ (temporary domain for development)