Zombie genre... raised on love of fear and cliches, which makes you shiver and comfortable at one time.
So, this particular game, "Trapped Dead", is a top-down tactical game in real time. It is no shooter, neither action like "Diablo", where all you need is to click faaaster. There you have to advance slowly, be ready to run backward, count every bullet, and killing zombies one-by-one. Flawlessly, if possible, because if they get you only a scratch , you will bleed, and that will attract many more undeads... You gonna need some skill with controls, certainly.
Most of the reviews on Steam are negative, for typical reasons: people who bought the game wasn't ready for it.
1) it is slow-paced and needs patience and tactical thinking much more than quick-reflexes
2) it can be buggy, at least in some cases, as I see. I suppose that somewhat portraying basic user who dislike that game - a schoolboy with weak PC and without skills to tune it and patience to simply let it go. Me personally, never had any serious trouble, maybe freeze one or two times when I alt-tabbed game for couple of hours on the office PC with built-in video... On normal systems with up-to-date software it runs fine.
For me, the only real down-side was lack of ammo. It is so cliche, you know...
So! I do recommend that game, but only if you ready to beat zombies with melee weapons at slow-paced tactical game with controls like in "command&conquer". Story is basic enough - get a team, get a supplies, find a way out.
Not a bad game overall, nothing fancy, but deserves 7/10 mark. Just not suited for impatient schoolboys.