I died on the first round, because I was trying to face the enemies head on, but then I remembered that this wasn't just a top-down-shooter hybrid, it was a Zombies hybrid, and did pretty well after that. It scratches the same itch of building up a train of zombies, walking them past your towers, and then clearing them out. Later on, it nails the great aspects of TD games too, where I felt like I didn't need to run away as much because I could rely on my towers to protect me. Great execution on this combination!