I was PSYCHED to see this sequel to Radiation Island, and eagerly shelled out the $5.
Now, 9 hours in, I can say it is much less of a sequel than I had hoped for. The crafting system that made Radiation Island so cool, dynamic, and replay-able, seems an afterthought in Radiation City. No cutting down trees, mining, smelting, crafting tools, or building... none of it.
The idea with this game is much simpler... scrounge and raid, gather weapons, clues, canned food, and find a safe place to sleep (somehow tents are the safest?).
That said, the game's graphics are amazing (you better have an iPad Pro), and the attention to detail is beyond anything I've seen on mobile. I've never been to Pripyat, Ukraine, but find it really cool that the city has been digitally reconstructed in astounding detail (Google actually has street views).
Still worth the money, but it doesn't live up to Radiation Island if you are expecting an expansion of the same overall experience. Assuming the developers leave the crafting experience as it is, I can't see myself playing this game much longer. Bummer.