As you may know, keys for this game and all of its DLCs have been mass revoked due to gogobundle/otakubundle not paying the keys and anyways the developers screwed lots of customers.
Depending on where these keys have been bought months ago, they can be either mass revoked or still alive (I still own a DLC key on my account, probably activated from another source than the bundles that have been revoked), so I'm terribly sorry to ask that if this DLC/game has been revoked to the winner, I'd like to delete the giveaway and don't support anymore that developer and that website.
I'm sorry 'cos many months have passed and I really don't like what happened, I hope to settle this crap over and not support anymore those who created this mass key deletion.
Obviously, if the key hasn't been revoked, there's no need to delete anything and luckily it has not been bought through the bundle site that the developer relied.

Further information:
https://www.steamgifts.com/discussion/Dmrlm/did-you-get-simple-story-alex-revoked
https://www.steamgifts.com/discussion/kSpDB/gogobundle-go-go-bundle-limited-75#tGKDRRB
https://steamcommunity.com/app/814200/discussions/0/2806204039993933601/