Abiotic Factor is half, er, Half-Life, half open world co-op survival game, and it's got a demo
Graham has been bandying Abiotic Factor around the Treehouse as "Half-Life designed for co-op survival japes", which is obviously a noteworthy combination of words, so let's have a look at the Steam page, trailer, and gosh, there's a demo here too. That's Friday night sorted.