[Convince me to buy Xenonauts.]

I have watched a series, but I can't differentiate between what's a mod and what's part of the updates. That's actually where I found the game.

[Convince me to buy Xenonauts.]

I have been messing around in the demo version of xenonauts for a bit, what reasons are there to buy the full version? What's been changed since v10.2? Anything added? Functionalities changed? Is it worth my 25 dollars, or is there not enough new content to merit the purchase?

Edit: That sounded rudely terse, didn't it? Sorry.

Edit2: probably should say hello or something since I'm new to the forums.