What are some alternatives?
When comparing PlayN and Pygame, you can also consider the following products
Unity - The multiplatform game creation tools for everyone.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
CryENGINE - The most powerful game development platform is now available to everyone. Full engine source code.
Polycode - Polycode is a C++ and Lua framework for building interactive applications.
Torque 3D - Torque 3D is a easy-to-use game creation platform.