Turning a deadline into a zombie that physically walks toward you is such a simple idea and it actually works - I found myself checking the app just to see how close things had gotten, which is more than I can say for any list-based planner. The weekly/monthly views and recurring tasks make it usable as a real planner, not just a gimmick, and the small bestiary/progression stuff stays light enough that it doesn't turn into a grind on top of your actual to-do list.