Great potential, but falls short.
No iCloud backup? Hmmmm….
Many complaints buy iPhone 11 users.
Game ends far to quickly as the waves of enemies come far to quickly after about wave 20. It destroys the zen like nature of the game. Waves need to scale much more slowly. After about wave 28 the waves are continuous and you are left just watching all play out. Your minions just fight and make new minions until you are overwhelmed.
The minion AI could use an upgrade. They needlessly pick up materials that are not needed. Run past weapons stations right next to them only to run to ones clear across the map.
All in all a decent game with great potential. Hopefully the developer will listen.