!!! Spoilers !!!
Well, you did a really great job ! I think that because our character is so... "numb" in the true LOVE run, we can feel even more the despair of sans. As an empath person, I needed to take breaks reading just to digest Sans's feelings haha.
I'm surprised we didn't fall into despair in the restaurant at the end of the second act, haha. When our character can't look at Sans because they fear that he is looking at us with pity or disdain... ah I felt that ! And the disconnect with the other people in the restaurant when Sans is gone and the sounds come back... Yeah, that scene was really well-made.
I realize I didn't speak about the true love ending. Well, it's because it was perfect. Soft, tender but with a bit of angst ! I loved every intimate scene, especially the telescope one : sans was so warm in it, and it's even better because it's in the first act haha. But each part was really touching ! And I loved the bonding time with Toriel, Papyrus, Undyne and Alphys. Seeing how they start caring about us between funny moments... I think it’s an important part of what makes the game a heart-warming experience for the player. (and even more hurtful in the sad moments :p) And the part after Flowey's reset... when we finally understand what Sans is searching in our soul (and that he's looking at us with hope, not pity) ... well I love every scene where sans is happy soooo.... But the best part is of course the judgement hall ! Full of love, I had to try every choice haha ! And I have to say that the result of a platonic love run was my favorite, like whoa Sans running at us and throwing himself in our arms... It's even better after a true LOVE ending haha (but only if you erase all your data before of course ! =) )
As you read, I have many feelings about this game, and it made me want to play undertale again haha, so thank you for making me come back to the fandom :p