The updates are great at first but it becomes not very useful after some level. The first upgrade is x1 -> x2 which is two times of current earning, but after some upgrade it becomes x50 -> x51 which is only 1.02 times of current earning which is very small increase.
It would be better if statistics can show the actual money / exp / gems per second just like idle empire 1. And I'm not sure whether ultimate gem mine works correctly. Current gem mine level is 33 which is 1 gem / 0.05 sec and ultimate gem mine is level 9 which is 10 times than normal gem mine. From my understanding I should get 200 gems / sec, but I'm only getting 110 ~ 120 gems / sec.
Where is the hidden feathers? I found one from the boss at stage 5. But I don't know where the rest feathers are.
FYI, you can get the code for the farmer from the website in the instruction.