For some reason the ending broke, once upon a time you could go over it, but now it just fades black. There is unlimited mode, messing with the SWF lets me access it, but I have no idea why I can't anymore.
EDIT: WE FOUND THE ERROR!
Me and Azanguru Dragon Quest ripped the SWF apart, what happens is that at the end the game calls for the highscore, but the highscore is broken because it's kept track on the old Rasmusiboy.com site, which is a secondary website, and it's down.
Since the site is down, it doesn't progress; hence it's broken.
We're working on a fix, but you know.
EDIT 2: We made a fix.
Look up the speedrun.com page of Pix City, it's there.