Road Redemption was just released on Steam. I played around with it for a bit. It has a lot of additional content than the previously released alpha. There are new maps and modes and a skill progression system. This game is very silly and doesn't attempt realism, which is the highest compliment I can give it. It wants to be fun and hot damn does it accomplish that.
There are guns in it now which are hilariously overpowered but oh so much fun.
It is still an early alpha though so you'll come across more than one amusing bug.
It's currently on sale for 17.99. I put a video together where I mostly just giggled the whole time.