What are the rules for the highscore category. What score do you need to get for it to be a high score. Is it a speedrun to a certain score or is it just getting the most amount of points possible?

Most points possible, following the rules in the category.

I'm honestly thinking the best way to do this is to just play a normal warpless run (diverting for 1ups), don't die, and get like 600k extra points for lives at the end.