You have to download "com.teamavia.residentlover-release.apk" and then install it with an Android file manager, and you will probably have to confirm that you want to install an app from an unknown source. You may also have to turn off some security settings on your phone, at least temporarily.
If your phone is not an Android, then you will have to play one of the desktop versions. It's only available as a mobile game on Android.
I hope this helps!