HalloWolf is a mod for Spear of Destiny, made by The Incredible Pete. A 2-level demo only, it was released on November 1, 2011.
As the title (and release date) suggests, it is a Halloween-themed mod with actors now being children in costumes, weapons being slingshots, and sprites are either autumnal or festive; jack o' lanterns, monsters and other spooky stuff is included.
Though only featuring 2 levels the mod features quite a heavy batch of coding that includes multiple textured floors and ceilings and a purple-skied cityscape.
Available in SDL only, the mod was sadly never finished.