That's really strange. Honestly I have no idea why it would get flagged. This is a regular RPGMaker game, it doesn't have any viruses. I tried asking that site to re-scan it, and it didn't have come up with any flags.
I have to assume it got flagged by mistake. No one else who's tried the game has reported any issues to me. But, if you still have misgivings, you can play the game in browser on Newgrounds: https://www.newgrounds.com/portal/view/1023472
But that version has some issues with text and can't transfer saves between updates.