A Space Inventory: Egress

Any fool with a copy of AGS can make an adventure game, but only a select few come up with ones that are truly worth your time. Egress is a game about astronauts and disaster (I presume The Dig is in an inspiration, but it also evokes the likes of 2001, Event Horizon, Moon and Defying Gravity), and while it can err a little too much towards trial and error there's a lot of clever stuff there, intermittently excellent presentation and an appropriately tense atmosphere.

Told from a claustrophobic first-person perspective, as well as delving into open sci-fi-horror and offering multiple endings, it gets across the anxiety and glacial slowness of lumbering around in a big suit in an unknown place really rather well. 50MB, free, from here.