hope it is not a re-gift

Thanks! Good luck everyone!

from FAQ
If I win a game, can I regift, trade, sell, or remove it from my Steam account?

According to our guidelines, no, all games you win must remain activated and redeemed on the Steam account you used during registration. Failure to activate games you have received will result in a suspension.

Hey, check your win of Tower Stacker. You have a red flag here because you have received a different app (with the same name) than what was set on the giveaway. You should get in contact with the giveaway creator, mods, or mark as Not Received.
More about it here if you are interested.