I forgot to mention this earlier, but I completed Rivulet’s campaign earlier today. The numbers?

Food: 210
Successful cycles: 42
Deaths: 88
Quits: 7*
Time: 03:01:52
< Met Looks to the Moon >**

The Survivor and The Saint achieved 
Two eggbugs killed

FINAL RANKING: 624**

*Most of the quits were caused by a softlock bug I encountered, in which the game would randomly tick-freeze while the rarefaction cell was running.

**I did actually meet Five Pebbles, but due to a tiny proto-rot cyst outside his chamber swallowing me on multiple occasions, I ended up skipping over him to save time. Correcting this discrepancy in the ranking would bring it to 664.