Blender's old game engine not a great choice. It has poor implementation of game development tools (especially for game deployment and commercialization), and it's even been removed from Blender as of Blender 2.8.
I recommend if someone is still using Blender's game engine to switch over to Godot since it's own language GDScript is very similar to Python, it has better support for doing game development, and it's completely open-sourced! (Though, I'm hearing rumors on the ground of a group developing a game development environment for Blender 2.8, though it will not be worked on by the Blender Foundation directly.)