This is game has a simple idea, but it absolutely delivers on it!
Ammo is always something that you have to look out for, you'll never have too much of it.
I really love the design of the gun. It feels very powerful against ghosts, the sound, the screen shaking makes really gives it a sense that you can put up a fight with it. Until that is, you shoot at the reaper, and it doesn't even respond in any way to it. The bullet simply passes trough it, and I think that's a perfect way of conveying that the dynamic has turned on it's head, and that now you're the one who is all powerless.
Eventually, more ghosts come and you can be easily overwhelmed by their numbers.
I think the challenge is fair, and fun!
I advise anyone who can to give it a try.