Hey,
I’m a Python fan with some 3D background, and I recently decided to move to Panda from pygame + moderngl and esper (btw ecs concept is awesome).
It was fun but it became too time consuming to develop all of the systems instead of the games itself (duh!) 
Obviously it’s just the start of an adventure, and sure plenty of questions will raise, yet, I just wanted to drop a hello and to say that You are doing great job with maintaining and developing this engine - I like the directions You took and the documentation is awesome.
Keep up a good work