Orcs Must Die! I'm addicted

I was just randomly installing game from my (massive) library and this one is so much fun.

1. Setup kill zones with Arrow Wall + Tar Trap
2. Send orcs back to kill zone with Spring Traps
3. Endless fun

There are a few traps seems pretty much useless tho (what's the point of Steam Trap?). Also I hate the maps that you can't focus on building 1 single kill zone. Just let me kill the orcs!