Completely agree with you guys and I'm sorry I dropped the ball with 1.15!
Most of our previous large updates did include a push notification, but I wanted to delay one about 1.15 as I felt that some hotfixes would be required after the initial release (which is pretty much what happened ), and with the delayed App Store release the momentum was lost afterwards.
I've already started thinking about the "What's new" window and some form of an in-game "Newsfeed", as I agree that it's hard for everyone to know what's changed in the latest update.
However, I would like to mention that things aren't that grim as @The one true king describes; we aren't actually losing players right now and our growth continues.
Our biggest drop in active players happened in the beginning of January when we stopped using Google Maps (you may have noticed that "Players Online" counter on domination.earth fell from approx. 5,400 players to around 4,000), which I'm still struggling to explain (does everyone hate black map that much?!).
But if anything, our last several updates helped us to reduce the uninstall rate by -22%, so I'm hoping that we'll recover soon.
Anyway, there will definitely be an announcement via Push as soon as the new construction system is live, and I'll work on the in-game notifications as well when I get a chance!