I was enjoying this a lot, but after getting the "boost all previous courses" after the blue switch, the screen went black. I can see my character outline, but nothing else. It persists on Quit-to-menu and resume.
EDIT: reloading the whole page also does not fix the issue. Had to delete save.
EDIT EDIT: Replayed the whole game from a fresh save file. I can see the emergency lights this time. I guess they just didn't load last time. Huh.
I will say that the game is still very good. A little too slow to ramp up at each area, but very fun with tight controls and pretty fun platforming. Good concept!