Happy fifth anniversary!
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To add to Leafo's answer, you can check at the bottom of a game's page whether or not it comes with a key. It'll say something like, "In order to download this game you must purchase it at or above the minimum price of $0.00 USD. Your purchase comes with a Steam key."
Thanks for the response! I'll probably get the bundle regardless. Like I said, my copy of Hustle Cat was bought directly on Steam. If you did add a feature, it would be great if it gave you the gifting option upon purchase, rather than only checking if the buyer has the game on Itch already.
It might be a different error, then. The specific message I'm getting in my browser (on Automata Empire, which I picked at random):
This XML file does not appear to have any style information associated with it. The document tree is shown below.
The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.
<StringToSign>GET 1505441309 /itchio/upload2/game/59781/288466</StringToSign>