Thanks for testing it, thats a shame- I'm not too sure what to do to fix this then, any ideas to all the people who have any idea what I can do?
Windows Defender famously flags nearly all rpgm games as a Potentially Unwanted Application. Anyone who's played Caliross is familiar with this annoyance, and even software startups have to deal with it.
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"Submit an app for malware analysis" to submit your app to Microsoft. Once they validate it, it will be whitelisted and no longer trigger that warning.
The downside is that as soon as you release a new version, your app will no longer match what Microsoft has in their whitelist, and you'll have to submit it to them all over again (I think you can get persisting whitelisting if you register with Microsoft as a publisher, but I've never tried).