This is fixed now! The resolution should be changeable in the latest update. As for the upgrade to Unity 6000, I changed because even the LTS version for Unity 2022.3 is becoming unsupported in 2025. Unfortunately for Windows 7 users, I think my builds won't work anymore like Soobaroo said.
Also, for those that want more frequent updates (or to report bugs) - here's a discord:
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. I'm also more active on itch.