It's not uncommon for games to have category extensions as an outlet for unorthodox, less serious, or even "meme" runs. These give a speedgame longevity by providing alternative ways to compete, even if those categories aren't most more exalted one.

Would anyone have suggestions for what they would like to see?

I do have a couple of nominations myself that I was hoping that you might consider. — Yesterday, I completed a run of Tunche at 2x speed by using Cheat Engine to multiply the game's speed. — I have also beaten the final boss from a "clean save", i.e. deleting all data and starting completely over, which is an exceptional challenge. — "Devil May Care", named after the achievement, where timing ends when an SSS rank is shown on screen. — Lastly, a meme category that one of my chat members recommended is an "X Gon' Give It to Ya" run, wherein only the basic melee attack button can be used to deal damage.

Even if we don't go through with any of these, I hope to put the thought into everyone's head. This game is great, and the more ways to play it, the better.

These are cool ideas, I think devil may care would be the best one allowing people to do a faster speedrun rather than playing the whole game.