I couldn't get past the third stage because I ran out of bullets after using up two guns, but I honestly think this is a pretty cool game. Even when I activated the momentum power I missed sometimes, so I found it easier to just memorize the locations of the zombies and shoot them reflexively, but the one time I did get it to work it felt pretty good. You should add an icon in the corner of the screen when you have the momentum power though, because the blue wrists are hard to see.