This was incredibly sweet and heartfelt! I went straight for the romance ending because Lemon is cute as fuck. Mars is such a sweet POV character too, I adore him and his design.
I did get one bug where the joke about the 'human whining' and Lemon's response to it were repeated once before moving on, and I also got the number popup that someone else mentioned. Other than that I didn't see any issues in my route.
Overall very cute and sweet, and a nice vent piece about the pandemic, depression, grief, and loneliness with a very gentle ending.