Greyfuss, the previous game Dev-Void was not a Darkside Game, Solarix was though. Here is flotsams review of De-Void.
My understanding is, that this one is 100% no action and more of a walking sim.
maggsie, all the games are within the last couple years so would play on any newer computer. I would read through some of the reviews on Steam and make a decision about whether or not previous games are needed to comnplete the story. Everything I can see, is that it is a stand alone game.