itch.io

They finally responded and fixed the issue. Thanks for helping!

I did, but haven't heard back from them yet. Just posted here cause in support's FAQ page doesn't make clear who's responsible for that:
"There are a few reasons why a Steam key may not appear. If the developer has run out of keys for their page, then you will not be able to claim a Steam key. When this happens, the developer is notified via an automated system to refill the keys."

Does that mean that you haven't been notified by this automated system yet?

I still don't have access to my Steam key

Hello! I just bought the game, but the steam key is missing. What should I do?