Are there any good full blown game engines where the user programs in Rust (Note I am NOT after Piston as that is not a game engine but a library used to make games, like Pygame for Python)?
How popular is it compared to Godot, is it well known?
There’s also http://arewegameyet.com/ which lists a lot of crates related to game development (not just engines).
Godot is certainly more mainstream. Rust for gaming is still rather new.