For some reason, some players have not been able to access the Steam key that comes with their Itch.io purchase.
It seems like some sort of error, and I've contacted Itch.io support.
I'll update this thread once the issue is resolved.

same problem here :(

Really sorry about that! I promise I'll figure it out :)

solved by itch.io support - thanks :)

Great! Did you have to contact them personally?

I’m also having the same issue, even though I have email addresses assigned to my itch account.  I have contacted itch.io and am waiting for a response. Great game, love it to pieces!

Hey! I've heard that it's an issue with Itch.io verification. Contacting their support team is the right thing to do - you should get your key soon!

Got it fixed by the itch team.

I made an itch.io account for your wonderful game as Steam controller support is awful, but felt I needed the key just so I could screenshot the game and let all my friends on the Steam client  know about it, worth the struggle!

I hope A Short Hike does amazingly well for you :)