I recently ran CGG for the first time and recorded it (may or may not be linked below, may be too large of a file) but the main summary is:
-Room with the tnt run mechanic (survive for 30 seconds) has a very confusing exit, the black door/exit looks just like an exit out of a dungeon which made me hesitant to enter
-Rocket boost room has nowhere saying that you can boost midair, which would be nice to know
-Pirahna is a bit fast and the explosions are a bit delayed in the wall which leads to pirahna catching you occasionally
-Greybeard I just pulled out my gales force and wind prisoned it and it died instantly
-Definitely easier overall than the 2 lower dungeons (CUR and CIB)
-Took around 15 minutes with morph olily, including a good couple minutes spent trying to figure out how to leave the tnt run room (especially confusing when it looked like I had to input the key somewhere, but that was for the room after)

