Neither a Google site search nor a forum search revealed a thread about everyone's favorite faithful X-COM indie remake. Let's fix this gross omission, shall we?
Ten minutes of the alpha demo convinced me to throw my money at their Kickstarter--and I've never even played X-COM!*
This game is brilliant, it's dripping with atmosphere and everything from the Geoscape to the various management screens feels dark and desperate. The ground combat is very tense with music to match. My only similar experience is with JA 2, but Xenonauts goes above and beyond in making you feel like a commander on the battlefield. Night missions are a treat--every corner and door is cause for trepidation. The art is utilitarian but very crisp. I haven't played any isometric 2D game that looks this good at high resolutions. There are multiple levels to ground combat (don't know if this was in X-COM), so it should be possible to station your sniper on a roof, for instance. Not sure how z-levels work yet, but stairs inside buildings do exist.
To me, the highlight of it all is the UI design. It's very... functional. It's mostly just text now, but everything feels right and nothing is more than two clicks away. I don't play turn based games or management sims often, but I knew exactly what each button did within seconds. There's just enough controls on the screen during combat and they're all obvious; I was prepared for a tutorial or trial-by-fire phase.
Of course, it's in pre-alpha, so chunks of equipment/vehicle art are missing along with descriptions of some research projects, and the animations could use a lot of work. The font is rather small, too. But it's already at the point where you stop noticing these things once you're twenty minutes in.
It's exciting to think about what this game will be like with better animations, greater variety in environments (ooh, forests, tropics) and a slicker UI.
* Okay, so I have played X-COM, but I never got past the first few encounters. That UI is draining.