It should be on your download page, it looks like we have plenty of keys uploaded, here are some instructions in case it helps: https://itch.io/t/67604/how-to-get-a-steam-key-from-your-itchio-purchase
Viewing post in Wildermyth comments
Unfortunately the link "claim steam key" just doesn't appear on the download page. If you want I can send you a screenshot if it helps ?
I've uploaded more keys, can you check again?
Nope, still nothing ><