It was a decent game, it got difficult to re route them especially in later levels. In earlier levels it is possible to completely keep them in one place through changing a single block, forcing the AI to keep re routing in two opposite directions so they stay in one place if you can do it fast enough.
I didn't play a lot, but it seemed cool. I feel like this would have benefitted from a high-score infinite style of game where you have to keep the orcs away from the end for as long as possible as more orcs come in from different entrances than the level structure.

But nice. And lol, the title screen and level select gives a hilarious first impression.