There are four distinct typefaces of note in JSR. The white font used for in-game text, and then the score icons, score itself, and timer. Brilliantly, their disparate styles combine to make one universal style: that of graffiti. The jumbo, toon-styled clock figures look hand-drawn. The score features diagonal lines which echo those of digital watch displays, only here they're used as part of a theme, not a convention. And the score display itself defies convention by including skewiff digits.
In terms of the text font, it's pleasantly boxy and uniform, even allowing a whole letter's worth of room for an apostrophe. The diminutive descenders and stunted ascenders give lower case letters extra impact, making the text look at first glance to be written in all-caps. The sans-serif style make this a surprisingly easy font to read, especially considering the tracking (space between letters) and leading (space between lines) is so sparing. It's necessary, though. Professor K would not be as cool in Comic Sans.