With referece to the yellow loop you marked, It looks like series-series to me. On the ouput side, the voltage across the load is being sampled and on the input side, the voltage across the voltage divider (formed by 100 K and Rg) is being applied to gate. So it can be seen as series -series feedabck. If there is a confusion about the input side (if it is series or shunt), I simply look it as a series because FET cannot be driven by current at the gate anyway.

It is a shunt-shunt feedback. At the input stage, the Norton equivalent should be taken into account. At the output, the voltage is directly sampled by the resistors in the feedback loop, injecting a current corresponding to the output voltage into the input port.

Which of the four categories of feedback circuit is up to you, the analyzer of it. You can analyze this circuit multiple ways assuming for error and fedback quantities either voltages or currents. For explanation, see

http://www.planetanalog.com/author.asp?section_id=3049&doc_id=564037