We developed 2 games on Android prior to this so we are experienced. And I always keep my code compatible with mobile devices just in case, so it was just a matter of player demand.
Otherwise it's wouldn't be possible in couple hours. Game development is complex and there are many new developers that are doing their best to just to release a game that works. I understand that it might be too much for some, I struggled a lot to release our first Android version for Kingdom Lost.