From WIKI :
"The core functionality typically provided by a game engine includes a rendering engine (“renderer”) for 2D or 3D graphics, a physics engine or collision detection (and collision response), sound, scripting, animation, artificial intelligence, networking, streaming, memory management, threading, localization support, and a scene graph."
How i understand we need particles animation, physics engine (Box2D,etc.)/collision detection (there is collision detector in GameView , class module) for B4A.