bldng1337/PXL ? reverse-engineered prompt

Build me a 2D game engine in Java with a built in editor so I can create, place, and manage game scenes and assets in one place.

I want it to feel good for pixel art style games, with simple rendering, basic 2D physics, and an editor UI for selecting entities, moving things around, and testing the game right inside the editor. It should let me organize sprites, scenes, and Java scripts without a lot of setup, and make it easy to run a small sample game too.

If anything is unclear, use the current docs online when needed, and keep the project easy to build from the Gradle wrapper. I’d also like a small demo project included, something like a simple Flappy Bird style example, so I can see how the engine is meant to be used.