You have two ways how you can control mouse on touchscreen. Based on quick review seems that Heart of China supports both way.
1. Relative mouse – this type is set by default, because every game supports it. Relative mouse emulates standard physical mouse. Use gestures (longpress, two point tap, double tap) for getting work right click or dragging. Or you can place “Mouse touch” widget on the screen and use this. Depends on you.
2. Absolute mouse – moves mouse cursor to place where you touched the screen. Use mouse touch widget or gestures for getting work right click.
For adventures and for “pixel hunting” I think is better relative mouse, but depends on you. You can quickly switch between relative and absolute mouse with “Mouse navigation” widget.