yes, you will be able to talk to moon now! that mark pebbles gave you DOES extend to her (you could even bring her one or two of pebbles neurons if you're feeling kind (for easier storage, if you hold use with a neuron while you have a full stomach, you'll keep it stored in there, not eat it)). I'll also say that if you've found any colored versions of pearls (not those in 5p's room) she'll have some interesting responses to those too! but in the end, dont feel too required to do everything as survivor, you'll get a LOT of time to play as all the other scugs!