Kree Java is a simple and lightweight 2D Java Game library yet has many features that can make a powerful 2D game. Kree's components is designed simple so beginners can follow along and make awesome game with the engine.
If you're just starting out making games you should definitely start here. Kree provides all of the back-end stuffs for you you don't need to worry how to load music/ sound in your game Kree will handle it for you!
Kree is mainly designed for beginners its syntax is minimalist and easy to understand and it is pretty similar to Unity's syntax so If you've used Unity before it's an advantage for you. Kree handles everything for you to develop a working game you just need to design the logic of your game and Kree will handle the rest. Kree is open source you can freely change the components behavior easily