Render your content with any engine with custom runtimes, each optimized for their system.
Nine Patch Images, Sprite or Bone Animations, Particle Effects, Fonts, Shaders and more.
Describe entities with custom variables, tags, identifiers to access later from your code.
Describe your scene light configuration by setting ambient light, and putting point and cone lights.
Store physics data for any item including custom shape polygons, deal with that data as you choose.
Use libGDX particles. Simply drag and drop them to the scene, rotate, scale and position to your needs.
Assemble game UI by creating buttons, labels, texts, importing custom fonts and giving each element an ID or class name in order to find it later in your code.
Overlap2D is open for many third party plugins. Write your own, or explore ones written by community.