Please help me.

It became free just recently and Sharp probably made the GA before it became free :)

I don't really know, since moderators are in charge of removing games from the list, not support, and I don't think there are any set rules about it so it's left to their judgement. But I think around 500 is the cut off.

They never do...

It's not happening. You can drop the key in the forum if you want, you just can't create a giveaway for it.

If you didn't win it here, you're fine here. The source of the key you give away doesn't matter as long as it's not, you know, illegal (stolen keys, etc.) or something you won on steam gifts. That said, I think you probably wouldn't be able to create the giveaway because it's been given away for free.

Like it was said earlier you can't create GA for games previously given away for free (Terablaster, gun monkeys, pixel puzzle japan etc) but it doesn't really matter where do you get your keys or gifts as long as they're valid.

My previous comment was written just in case if you didn't know the rules of steamgifts and I wanted to warn you about it so you know it in the future and don't make a mistake.
If you win a giveaway on steamgifts.com and regift won game or don't activate it you can be suspended here. It's only if you win a GA on steamgifts.