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At first I was worried this was going to be some fidget spinner-based game, but after reading the comic this is based on, I don't believe it's going in that direction.

But I can't find out.  I have Javascript installed on my (Windows) computer, but I can't get this game to open.  And there are no instructions for install on the game jam page or on the actual game page.

Won't rate this out of fairness, please let me know how to open this--I really want to play it.

There should be a launcher script in the folder. You need Java installed to run it. Just run the launcher for your respective OS.