I love the idea, but none of the games quite fit for me.

What programming language is the games made in?

Can 3d printed pieces be used?

Yes, the SDK is built for Unity in C# with Unreal/Godot to follow.

Please reach out if interested to develop: https://board.fun/pages/developers

My colleague has some discussion here about 3D printing pieces: https://news.ycombinator.com/item?id=45754851