Yes the GOG version is up to date. There is a enough in here to call it a reasonable game, but it's method of delivery might leave a lot of people cold.
The 8-bit graphic style is fine, but basically you spend a lot of time staring at the shelter with occasional flips to fixed scenes for your scavengers on a mission, then back to the shelter again.
It's also a very long grind of a game. You need to send people out almost constantly to gather fresh supplies and crafting gear, and the crafting scheme soaks up a lot of resources. There are upgrades as well as unlocking higher and higher tiers of items you can craft. One decent new item or upgrade in your shelter will mean a lot more expeditions just to stock up on the items you used up.
So it's a very repetitive game. Mostly repairing items in a shelter while you wait for a quick flip scene from your expedition members, then they hopefully make it back. Then if you're lucky, a quick upgrade or maybe a new item, then send off the next expedition.
It really depends on the player whether they are going to find enough challenge in the game to make up for staring at the same shelter for hours while they grind through the crafting tree. It's possible you might ... so some stars .. it's possible you'll get bored enough after a while to just not care .. so not 5 stars. The game has enough content, but for me the presentation of the content got too boring to want to carry on.
Also worth noting. The Linux version doesn't save your resolution / full screen preferences, and for me had a quirky (window flickers a lot!) startup. In the end I found it less hassle to download the Windows version and run it under Wine.
