They help her escape from the plain world into a vast ocean, full of waves and tides. "t<span>here had been no night in the last two years that Mildred had not swum that sea", which suggests that she has gotten so used to listening to it every night, she would be unable to sleep without it.</span>
The good angel begs Faustus to stop searching the dark arts for "forbidden knowledge" because God’s wrath will fall upon him otherwise.
Whenever the state of Faustus's mortal soul began envisioning, the good and the bad angel appeared. The good angel tries to convince Faustus to return to God by renouncing his sins. The good angel and the bad angel here are the literary devices called allegory i.e., they are in concrete form, from the personification of abstract concepts. Therefore, here Good angel symbolizes Faustus's Desire to repent.
I would think the lead but I'm not 100% sure