I enjoy Hatred. I'll be honest though, there really isn't that much to it. Its a fun twin stick like shooter, and feels a lot like a modern postal, and every level you have objectives as to where you should go to shoot up next. Police will show up, and you will fight them. And that's about it.
Its not the kind of game I would sit down for a long period of time. But its the kind of game you will pick up time from time and have a fun little session for about an half hour or so.
For 20 bucks, I would probably wait for a sale. 20 bucks could get you Ori and the Blind Forest. ;o
Have you tried Hatred? Do you plan on getting it soon? How was your experience?