Keolot Phaser Editor is a free visual development environment for 2D browser games based on the open source Phaser engine with integrated Matter JS physics. The application provides visual creation and editing of scenes, game objects, animations, audio, and keys, along with writing game logic in JavaScript with support for plugins and global scripts. The editor includes an interactive design surface where objects can be moved and added, zoom controls, coordinate rulers, and two preview modes: current scene preview (with debug physics and object inspection) and full game preview. A debugging console displays errors and warnings.