I got my hands on some of the files, so might as well upload one of 'em. :P
There are 25 lines in total as far as I know.

Also no, the game over sprite for Boyfriend is custom, as I just edited it a little.

The game itself:
itch.io (+download): https://ninja-muffin24.itch.io/funkin
Newgrounds: https://www.newgrounds.com/portal/view/770371