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Well that is extremely weird. Are you using the Itch app or did you download the file ? It looks like the data was corrupted somehow - one of the assets is only 25% as large as it should be. 

I am using the itch.io desktop app to run the Helium Rain launcher exe file. I closed out of my first session from the GUI -- I didn't use alt + f4 or anything -- so it's not like I closed the game while it was still saving.

This isn't caused by a save problem, the static game data was corrupted somehow - the game itself can't do that, as it never writes to that file in the first place. It may be an itch bug, or a hard drive failure. You should try reinstalling the game.

Reinstalling the game seems to have fixed it -- thank you for the help!