Sullen : Light is Your Friend key revoked by developer

in this case i guess it would be the best to contact support.
they can set your "received" status to "not received".
since you cant contact the gifter and allow them to delete the giveaway, this might be the only option.

Edit: it would be great if you had a screenshot of the message that popped up when it got revoked as proof for support.

Have you tried to use search in Gifts Won page in your profile?

https://www.steamgifts.com/user/Zynthetic/giveaways/won/search?q=Light%20is

I won the same giveaway, and now the key has been revoked, and I've seen your thank you comment on there.
I reported to the creator that the key was revoked and told him about this thread too!
The creators will probably delete the giveaway.

Dev's explanation

Game dev doing a scam movement, we have seen this before.

When will these devs learn...you are a dirty dev when YOUR problems result in the loss of our money.

My won was 2 years ago and revoked too.
By the way, what is this developer doing while 2 years?
Store show the early access and only 4 screenshots.🤣

Won it as well. This is the 2nd time in as many weeks a small indie dev decides to revoke keys to get back at a middle man. Steam really needs to put measures in place to force review before revoking activated keys. Devs that abuse this should be banned.

The developer is replacing keys of those who have receipts for their purchase. In your case, I'd email the developer a screenshot of your win, along with your comment in the won giveaway. It may or may not work, but it would only take a few minutes to try.

I don't see an email address anywhere, so you may have to add him on Steam to speak to him.

Game reported as fraud ✔️