The Ironhide art style just really appeals to me. It's like this simple yet not simple at all style.
Anyway, this is probably the second best TD game I know of. I can't count the amount of hours I've logged on this on my cell, and I'm not much of a cell phone gamer either. It's somewhat similar to the Cursed Treasure 2 game, don't know which one came first, but it's still got enough differences that this is a seriously enjoyable game. And that's coming from someone that generally can't stand TD games.