I think it is just over a full year that I have played this game now, through all sorts of very buggy stages and through numerous save game corruptions.
I have to say that at release, in the un-modified version, it doesn't feel finished. Base management is quite basic and is nowhere near as involved as the original games. Combat is still glitchy with many scenarios in which objects block or fail to block fire as expected, a rocket launcher can flatten an entire office building to the ground in one hit with no wreckage left. Graphically, it is in my opinion quite an ugly and out dated looking game with styles that don't mix well.
On the good side, it plays okay and the modding community are probably going to be the ones that transform the game in the long term. Without add on map packs, effects, weapon mods etc...the game you buy is repetitive and lacking.
So if you buy it, bear in mind that I think player made mods are going to make this game special. The dev team for the game have openly admitted to being burnt out on Xenonauts and their discussion to date suggests that they have had enough of the whole project. I wanted to love this game, having played the originals from floppy disk way back in the day, but so far I'm giving it a grudging 5 out of 10.