Being an engineer at heart, this game appeals very strongly to me. It offers several weapons that work in wildly diferente ways, enabling you to pick the strategy that works best for you. Being constrained by a tight budget to build your fortress, you have to choose if you want to prioritize firepower, defense, speed, maneuverability, have a balance of each or anything in between. And, on top of that, there's controlling the fortress itself, which is a veritable challenge and lots of fun.