Nice, I love Half Life 2, it's one of the all-time greats!
Regarding the issue you're experiencing with my 2nd game, The Fall of Ravenwick Castle... currently the combat system is designed around casting magic at the feet of the enemies. As in, you cast a 'Seal' in front of a zombie, they walk into it, it triggers for damage. If I remember correctly, zombies currently take 6 or 7 hits to kill. I should probably add some sort of animation to indicate that the zombies are sustaining permanent damage after they've been hit by a spell... I'll add it to the list of improvements to make for the next patch.
As for Little Red Riding Hood... there's definitely going to be another game in the same style coming soon, hopefully by the end of the year!