Tried HTML and Mac. Got a script error on HTML (that's all it told me) and when on Mac, it wouldn't let me save. I would click [Save 1], hit the [Save] option and it would tell me I need to select a file. Does saving just not work? I'm going to try the windows version with wine, see if I get better results.
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Sorry to hear you're having trouble! Have you tried playing the HTML version on Newgrounds?
Also, have you tried playing the HTML version on a different browser? (Firefox, Chrome, Edge?)
The Mac version for whatever reason has trouble saving, but unfortunately it's due to the way RPG Maker MV handles saves. The only workaround for it is to build the game on a Mac, which we currently don't have.
The Windows version should not have issues saving.