Quite a few people asked about it, so we would like to make it a bit more visible.
The Quest is also available on Google Play.
And in the App Store.
The expansion is also available in the App Store and it's coming to Android soon.
Save games are freely copyable between all these versions. (If you have a character which has been to the expansion, it requires the expansion to be properly loaded.) Here is information about where to find the save files.