I agree with butchy - Templar Battleforce is pretty shamelessly ripping off Space Hulk and 40K in general, but it's actually very enjoyable.
It can best be described as a turn-based version of Dawn of War 2: lead your squad of 6 Not Space Marines through the linear campaign across various planets and spaceships in fights against different types of Not Tyranids and other types of xenos (seriously, that's what they call them).
What sets it apart from Space Hulk is the fact that the levels are far more open and not entirely made of cramped corridors and there are more variety in your types of Not Space Marines, who can be specialised throughout the campaign individually as well as getting new skills and equipment through the game's humongous "research tree", which you progress through by spending points aquired from completing mission objectives.
Gameplay itself is turn-based and revolves around AP management, much like Space Hulk: each character gets 5 AP and 6 movement points which can be spent semi-seperately, making running and gunning a viable strategy in many cases - you can't fire and run indiscriminately, however: Not Space Marine mecha suits are apparently shittily made and overheat quite easily if your troops strain themselves too much gunning down aliens, causing DOTs to your troops from heat without proper management, adding an additional layer of strategy to squad management.
The similarity to DOW2 involves the fact that some missions include Requisition Points, which are basically resource-generating factories you can capture with your engineer heroes to recruit replacement heroes in the field or produce consumable items such as medikits or extra grenades or other weapons. This particular feature is fairly tacked-on, to be frank, and the game wouldn't miss out on much without it.
It has a bunch of problems, most notably that you can't pick which troops you'd like to bring along on a mission but tend to get saddled with at least one fairly useless scout, but it's overall an enjoyable experience. It's not quite Xcom, but I'm having a lot of fun with Templar Battleforce and my squad is progressing nicely. It's worth the 8 euros I paid for it.
