You can currently get The Outer Worlds with all its DLC and Thief free from the Epic Games Store
Amazon Prime Gaming has a couple of big giveaways, too
Yes, The Outer Worlds mechanically resembles the Fallout series. It was made by the same team that worked on the first two Fallout games. It's built on the skeleton of Dungeons and Dragons. This is not dissimilar to what Fallout has become under the ownership of Bethesda, though I will say that I have not felt as motivated to finish Fallout 3 or 4 as I felt to finish The Outer Worlds.
2018 was a fantastic year for the gaming world at large, but for PC gamers, it was a bit of a mixed bag. Kingdom Come: Deliverance launched in February to great success and other titles like Shadow of the Tomb Raider, Forza Horizon 4 and Vermintide 2 were received to excellent user impressions. What's in store for 2019?