Here are the changes so far:

the scope and function of the emitter system.
Corrected:
Child and emitter objects are now correctly added to the map.
Various improvements in object management.
The content is new:
"MotherSpider" : lays different versions of spider eggs.
Flare effects added to treasure chests to make them more visible.
Minor changes to the graphic.  (Darker background)
Small spiders lay spider web. Currently, this is not removed from the map at runtime after LifeTime, like other emitter objects.
This is used for the stress test of the engine.