Hey, thanks for the followup! I went back and played the game again and this time I got to the end, though it took a couple tries. I think I may have gone to the lakes in the wrong order, but I'm not sure if I misclicked something or if it was an actual bug. Unfortunately, I also don't remember if I had completed the dialogue near the un-pushuable boulder, but I didn't have that problem when playing it today.
Sorry I couldn't give you more detailed explanations of the problem I encountered :(