Popping in from Civ3 via Blake and I just want to say I'm following with great interest. It's really impressive how much you've managed to put together this quickly and with WinForms no less. I disagree with C/C++ though. Yes they've historically been dominant in both OSS and games but C# is the more popular language these days and much more approachable for would-be contributors. Between Monogame/XNA, Unity, and Godot, it's probably what the majority of amateur game devs are using.