Interesting! Some feedback:

- Try to make it clear in the description that it's software rendering (it's easy to miss this information).

- The readme should include a clear list of features.

- Be aware that the AGPL license might be a problem for many people.

It's always exciting feeling to get some feedback from community, so here you go! The project looks fun, but could use a bit more docs. I was able to compile for esp but didnt test yet. I only have a cheap aliexpress esp with builtin lcd, might try to hack it

Well done!

You mention the point is to make it portable. Does the project have any other goals, like, what kind of games could be made with it, how fast does it need to be? Do you have any performance metrics to share?

Wow a 3D engine written in C++?