Okay, so I managed to get all 4 endings, and I dislike advertising my videos in itch.io comment sections, but I hope the video serves as a guide to anyone interested in finding all the endings. One little hint for those that only want a small nudge in the right direction though: You can interact with some things in the environment that do not have circles on them. There are a total of 5 things to find, and the first of which has to do with the two botany rooms. Good luck.