Thanks for commenting!!
I'm not sure for sure, I've already had this game on steam for many, many years (I think I won it in a humble bundle in 2014) which was curiously the last time I opened it to play, but I met SteamGifts today and remembered that i had this key on steam and it is named "Unknown package 28888" , but I know it works because I did a test earlier and it was playable