"OctoMouse" did not appear in Security & Privacy > Accessibility access, even after clicking the trigger in the menus and moving to /Applications.
Removing sandboxing (i.e. setting it to false) allowed the app to appear in Security & Privacy where I could then check its entry to enable keystroke counting.
Changing signing authority to default ("Sign to Run Locally") instead of "Mac Developer"
Otherwise, build will fail if "Mac Developer" is not found
Nice app! This PR fixes the two issues when cloning & building on macOS 10.15:
Sandboxed apps (generally) don't have an ability to request Accessibility privileges, blocking keystroke counting.
/Applications.Changing signing authority to default ("Sign to Run Locally") instead of "Mac Developer"