Hi! I will take a look at this over the next couple of days on the forum. We are currently in crunch time trying to get the last few things done before Early Access
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You should be able to download the backers demo and also you should get a steam key. The steam key will not yet be downloadable but you can download the backers demo from itch.io. You should have been emailed a link to the download.
The steam version of the game is not out yet, and will be releasing in a couple of months. At the moment you can play the backers demo which you will have been given links to download via itch.io. can you tell us if you are having trouble playing the backers version?