It’s sad, but as a crypto user I’d be sketched out enough about using a centralised hot wallet app like Exodus in an official capacity, let alone entering my private key in something installed via a 3rd party app store. This probably happens on the Play Store a few times a week, and that’s on a bigger platform with a full security review process. It’s ultimately unavoidable.
You could just refund it if it doesn’t work well for you. GOG are usually pretty generous