Xenonauts is busy getting to Beta, so I doubt they have IndieDB on mind right now, because it hasn't been posted on the forums yet. This great event is about a week long so we'll see. Shhhh, don't remind them.
I hope UFO reaches the next top list! I really love how the game is looking so far! You control a secret organization?! Heeeell yeeeaaaah!!
Anyways, My vote goes to UFO over Xenonauts because UFO is open-source and free for the world to play! I love how Xenonauts is looking but they don't need attention because KS already funded them, not to mention pre-orders continuously being sold, they're fine. UFO all the way!
Good luck, X-COM family