Whilst not strictly a game per se, it might be worth mentioning that if you still play L4D and watch the SFM Youtube films, it is quite possible that you may have missed this series. A fair warning though, it is extremely dark (but very well animated).
In other news, I've got some gameplay videos on my Dailymotion page of Toxikk (video
), the latest one being against Godlike bots. As you imagine, things didn't go well for me.