I can't say the game is bad, its actually above average in general, but the menu interface, with the 'Quit' button in the bottom right corner of the smartphone screen, has caused me some frustration. Since saves are manual-only, I've lost progress a few times. Unfortunately, the developer hasn't implemented any kind of confirmation window before quitting, so the game closes immediately. This has led to wasted time replaying content. While this wouldn't be a significant issue with an autosave system, I found the current implementation of the menu with tricky "quit" button to be one of the worst examples of industry practice I've encountered.