Cool! Nice work!

You can now add lights by right clicking.
I've also differentiated between static and dynamic.
make sure you create static casters BEFORE static lights, otherwise they won't cast shadows.
create_caster has been replaced with create_dynamic_caster and create_static_caster

Just create an object and in it's create event add something like...
create_caster(x,y,x+16,y);
create_caster(x+16,y,x+8,y+16);
create_caster(x+8,y+16,x,y);
Basically, just define the edges of your shape using caster lines.
I'll be adding static/dynamic differentiation soon to speed up the engine even more.

It's pretty cool, and doesn't run too slow. Would be nice to see with objects with different shapes.

This is a basic lighting engine I made.
It features fast dynamic shadows.
It's much better than my cruddy ray system.