Thank you for your very valuable feedback.
1. In the setup phase, I designed the Mana/Gold to be in the bottom-left of the window, but during gameplay, it is in the top-right. This makes players confused. Thank you very much for pointing out this design flaw, I have to redesign the UI again.
2. For this part, I admit that I didn't finish it in time, but thank you very much for highlighting that this is very important.