I learned C++ to make a Godot extension that can deal with 2200+ agents in a pathfinder. Shared flowfield + spatial grid based steering, wall repulsion, neighbor avoidance. And a demo track called "wheel of fortune".
It will serve a basis for my next prototypes. I have 2 main ideas : a tower defense as a small project, and a supermarket management game that could include those tower defense elements. Think "they are billions" but the crowd won't be necessarly an enemy, more of a resource to drain.