Gauntlet is pretty fun to speedrun in my opinion and although it doesn't have much activity the current rules for speedrunning this game under all its current categories are completely unacceptable. Let's go over each and how it can be made better, more fun for the players and more entertainment for the viewers.

Glitchless (current rules): Time starts when pressing "Start Game", Time ends when cutscene after Morak starts

I'm ok with the time starting at "Start Game" and ending at Morak's death cutscene. Here's the issue though, this game is played on ps4/steam, once you've played through the game once you unlock all the stages to immediately pick. The vagueness of this rule allows you to select easy mode, and kill morak in less than 2 minutes (on the 1st phase even) if you're lucky enough to land 3 sword hits and a ring of illusions spawn directly on top of the correct morak. Which I have submitted as my own world record time being 2min 21sec.

No wall boosting, warps or any other glitches.

This is ok as a rule but it's also vague about what is and is not allowed. It does not point out what constitutes a warp, the importance here should be more directed at completing the regular stages without going out of bounds or clipping walls in game, or other major game skipping methods.

Additionally it is important to clarify in the rules whether or not you are allowed to use unlocked weapons, relics, and talismans. Preferably they should be allowed, as optimizing your character is not level based but preference based and once you unlock something for your character you keep it forever. Intentionally limiting yourself to 1 weapon (the default) allows for no creativity or variety in a speedrun. And of course limiting your talisman to the default makes elf by far the best option as he can clear multiple spawners more optimally than other characters default, and not having a relic just slows down gameplay further. There would be no planning behind a somewhat major cooldown for clearing rooms in a more strategic way.

Switching characters should also be fine, this game is very balanced (even the necromancer is) and some are better at dealing with certain stages than others, it's all a matter i guess if you want to sacrifice the time selecting another character for a certain stage.

In the end the rules should be the following imo: Time starts at "Start Game", complete all main path stages, time ends at Morak's Death scene trigger.

No going out of bounds or clipping walls in game, or other major game skipping/breaking/glitch methods.

You are allowed to use unlocked weapons, relics, and talismans. (And switch characters for different stages submit most used character)