• JavaFX 15
• Multi-Layer Rendering
• Parallax Background
• Canvas Particle System
• Dynamic Texture Manipulation
• Sprite Sheet Animations
• Entity / UI Animations (+ interpolators)
• Adaptive Resolution (w and w/o Fullscreen)
• Customizable Intro Video / Animation
• Customizable Main Menu / Game Menu (3 built-in menu styles)
• Customizable UI elements (Dialogs, Bars, Buttons, etc)
  
  
• Customizable Global CSS for menus / UI elements
• Voronoi Tessellation
• Post-render Effects
  

• Global / Scoped Event Bus
• Time Management System (in-game time + real time)
• Multithreading / Async Tasks (+kotlin coroutines)
• Console / File Logging
• Performance Monitor + Profiling
• Developer Panel
• Developer Console
• CVar (globally accessible JavaFX properties)
• GC-free Object Pooling
• Annotations Metaprogramming
• Application State Machine
• DSL (domain specific language, available in Java, Kotlin and JavaScript)

• Full Game Loop
• Entity Component Control System
• Quick Time Events (QTE)
  
• Achievement System
• Notification System
  
• Saving / Loading System
• User Profiles (Save/Load/Restore Game Settings)
• Level Parsers (.txt, .json Tiled Map Editor Support using jackson)
• Quest Tracker
  

• JBox2D Integration
• FXGL Physics (BBox + SAT)
• Unified Collision Handling (JBox2D + FXGL physics)

• gdxAI Integration
• A* Pathfinding
• GOAP (Goal-Oriented Action Planning)
• FSM (Finite State Machine)
• JavaScript Behavior Injections (for entities) + JavaScript FXGL Environment Variables
  
  

• Key & Mouse Bindings
• Bindings Management (players can rebind actions in the game)
• Full Input Mocking

• IO Task Mechanism (exceptionless functional paradigm)
• Networking (TCP and UDP)
• 1-1 Server-Client Support
• Asset Management (.png, .jpg, .wav, .mp3, .txt, .json, .kv, .properties, .fxml, .css, .ttf/.otf, custom)

If you have a use case (feature) that FXGL doesn't cover, raise an issue, carefully describing the use case.