TerriblePurpose: I suggest getting a refund. I nothing else, it will demonstrate that you as a customer are not willing to accept them moving the goalposts after they've got your money. Plus, it will take money out of their pockets right now. I'd also suggest waiting until it finally appears on GOG, and since you'll have already waited for a year, wait a little longer for a good discount. Then buy, and e-mail the devs and point out that you bought it at a steep discount, thus they made far less money than they would have if they'd just fulfilled their promises in the first place. There's not much else you can do. But I personally am going to wait and wait an wait until I can grab the full edition of this game for less than 10 bucks. Not that I think it will make fuck-all difference to them, but if enough of us do it, maybe they'll actually notice.
PaterAlf: Unfortunately getting a refund isn't a good option as well. Refunds won't get handled by Fig who collected the money. To get a refund I should give my credit card details to a third-party-company I know next to nothing about. I don't feel comfortable with that.
Also they won't refund you in the currency you pledged in. Which means because of currency conversion I will get back about 10% (didn't check the exact currency conversion) less than I paid to them.
I wrote them a mail and told them how I feel about the whole move and that I won't support any of their future projects. Guess that's all I can do.
Unfortunately, the refund system sucks, and it seems it is going to hurt you (you will lose money with the exchange rate in any case) more than Snapshot Games.
I decided to keep my pledge so that I can still get my game when it is released on GOG. This doesn't mean I'm not upset; I'm really pissed. This was a mean and greedy move, and there's no way Snapshot is going to fix this and recover from the shit storm without the use of time-travelling technology devices.
But unfortunately not much else can be done right now...
Some good news:
Xenonauts 2 will be released tomorrow. It may not have the same budget/quality as Phoenix Point, but it is done by honest and trusty developers who care about their players.
EDIT: Xenonauts 2 is not officially released tomorrow, but that's the expected date for early access launch.
EDIT AGAIN: Xenonauts 2 early access launch has been delayed.