Mmm I think the characters being "elongated triangles" in the menu, isn't an issue of the font not being on your pc. Since Renpy (I assume this is what you used, RainbowJellie, to create Starcrossed) "bakes" the fonts into the project. I suspect its because whatever font is used, it doesn't actually contain the character glyphs for numerals.
As for the music, the only thing that bothered me about it was the long instances of there being absolutely no music whatsoever.
In general though, I did enjoy the demo so far RainbowJellie! I found it very lighthearted despite the seriousness of earthly destruction and bodily injury. I don't know if that was intentional or not, but I think it's because the tone was very cartoony...I even got alil Sailor Moon vibe to the entire thing (That's a GOOD THING! imo anyways ^_^ ). Cute!