Last time I was playing, I made it to 8 hearts with Maru, which prompted a scene outside of her house one night. According to her wiki page, the scene in question was the 8-heart scene.
As I looked into it a little more, I realized I missed the 4- and 6- heart scenes. Is it still possible to trigger these, or did I miss out on further relationship building?
11 Answer
It's been a few days, so I can finally say this with confidence, and Ross Ridge confirmed:
The Wiki is wrong.
I was only at 6 hearts when I viewed what was considered the 8-heart scene, and only got the 4-heart scene (according to the wiki) upon reaching 8 hearts. So it would seem that you are able to view the scenes in any order, so long as you have enough hearts to view a scene.