This game needs some rules regarding timing, what collectables need to be picked up and what ending one should choose.

Can you give more details for what categories are applicable? What category would the current run fall under? The mod hasn't logged into the site for over three weeks, so maybe message them on Twitter or something.

Apologies. I at least set rules at least for when timing begins and ends. As much as I've played of the game there isn't much in the way of glitches that I've found (certainly none that are helpful, sometimes you fall through the floor but that's always ended in a death for me.) So gameplay-wise, the any% speedrun is pretty clear cut. TCD11 asked on Twitter what endings are viable. Chapter 18 is the obvious choice for Any% as you don't need any of the collectibles to end it. I think the two other endings are less obvious though. The only way I can reconcile it in my head would be to have both an "all collectibles" route which would necessitate collecting the orbs and playing level 19. Although an argument could be made for instead having a "100%" category in which you collect all the orbs, play level 19, and type in the secret code for level 20, and completing that level. I'm certainly open to discussion about it.