(Finished the pacifist playthrough)

Undertale obviously borrows from the Mother series, but it's interesting to see this fan game tackle the theme of grief in more detail than Mother 3, where the game would do time skips and the player never sees how Lucas and his father try to recover from the loss of Claus and Hinawa (until it comes back at the final boss)

The reason I don't give this a higher rating is because Undertale Yellow can get a bit bland at times, especially on the western section, because it takes place in the same world as the base game and apart from different environments, there's not a lot of interesting lore to uncover and most of its emotional impact (the story of the secondary characters) is kept at the last fourth of the adventure. Compare that to how Mother 3 is constantly showing how the island evolves and how the citizens fall victim to industrialization, which gives you morbid curiosity through the whole playthrough to see what those once humble people turned into.