Are you sure the key is for the removed game?
Pew-Pew Rocket https://steamdb.info/app/1145680/subs/

Maybe this key from the new version which giving away on giveaway_su?
Pew Pew Rocket! https://steamdb.info/app/2469900/subs/

confirm on the steam page that the title purchased was the same as the one in the store, this way you can confirm, if it is not the key drawn, it may appear not received

obrigado

Thanks for the giveaway! 😊🎁

Thx

MaRsun has right.
Please delete this giveaway because the winner will have a problem because he will accidentally activated and marked it as recieved,but in substance he won't because it's https://steamdb.info/app/2469900/ and not https://steamdb.info/app/1145680/ you have created.
Ιf you don't believe it ask the administrator when month pass from the victorious giveaway day.
Just delete it and mark the corect game when create the new one.

Thanks!