Cave Story+ key (maybe)

So, I'm pretty sure I still have a couple of unused keys from HIB7. I tried activating Cave Story+ a few months ago, but I think I already had the game, so the key should be still redeemable, right? Anyway, if you don't have the game and want to give it a shot, just be the first person with a contribution of 40$ or more to post here. I'll add you on steam and give the key through chat.