There is a way to download embedded games.
Just download the itch application and install the game from the application
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Well, since I did say "there should be a way", I appreciate the reply. Now I know there's a way.
I still don't think it's a good idea for the designers not to make an offline version available, and I'm certainly not going to download an application exclusively for the privilege...
...but you addressed exactly what I said, and provided me with a possible solution. Much obliged.