Just making a note here that in spite of the page stating it requires Win 7 or newer, it seems to run on Vista without too much issue.

First run it refused, crashing on a file called BEX64.exe, but upon manually launching Stories\Binaries\Win64\Stories.exe the game launched without trouble, and afterwards also seems to be launchable through Galaxy without issue.

Sure I know this isn't the same as saying it's bound to work on Vista, just noting I've had success with it...and that I really ought to at some point get around to upgrading my old desktop.