Cool! Thanks for following up. I wonder if there is a room for LibGDX going forward now that Godot is getting big. I expect to see some consolidation among open source engines, with Godot becoming the big all-purpose engine and things like Love and Ren'py for more niche use cases.
Godot is very different. It's closer to a Unity competitor. Most games, should go with Godot.
LibGDX is more low level. It's like a java wrapper around OpenGL with some nice libraries for: math/sprites/algorithms/gc-friendly data structures/other structures (octrees etc) and abstracts away platform specific details in most cases so you can have the same code for android/ios/desktop/web.
Ingress is also LibGDX, but they switched to Unity for Pokemon GO.