Thanks for your feedback. Actually, I find the problem when I'm testing, but I find it hard to balance. It just gets either too boring or too difficult after minutes. Maybe I should add some bonus after one game is over like some roguelike games do to make it worth replaying, and dig into some theories about the difficulty curve as now it only depends on my inaccurate feeling.
And about avoiding losing, there is no way at the present, because it doesn't even have a "win" ending and is designed to end at a point to represent the contradiction between people's increasing demand and limited resources.
Anyway, thanks for your playing, and sorry for your confusion.