I don't think everyone is going to like this game as much as I do. The controls are hard to get used to, and it is sometimes difficult to understand what is going on and what you need to do. However, I got a handle on it, and found a game that is very unique compared to other top-down shooter survival games.
You're encouraged to charge forward at all times, shrugging off damage because you can heal by drinking blood. I'm not sure you're intended to be able to just ignore damage as long as you keep killing demons, but it's immensely fun to keep up that streak for a number of reasons. In summary, it's simple, but I had a blast with it.
(best score: 57753. I probably could have gotten higher, but I had to get dinner)