Both. Just disappeared from my purchases. It is installed on one of my devices, and in android there is a button that leads from an app shortcut to Play Store page [0], but pressing it just brings you to a blanc page that displays an endless loading indicator.
I wonder if this is some kind of regional issue. I also bought this version(about 10 years ago?) and was able to reinstall it and play just fine directly from the link you posted.
EDIT: Looks like it doesn't scale correctly though, and I get a warning that the game doesn't support my version of Android! What a shame.
[0]: https://play.google.com/store/apps/details?id=com.twodboy.wo...