First off, I haven't tried any updates since the jam, so keep that in mind.
Anyways, I'm a bit 50/50 on whether I think it would fit as a longer experience.
I think the production quality was high and I enjoyed it, but the concept could use some changes if it's a longer experience.
Unlike a normal metroidvania where you constantly get stronger, a bondage themed metroidvania stops being bondage themed if you remove all the restraints. You already mentioned having some ideas, so I'm sure you've already thought about this.
Essentially it either needs some kind of progress/power-up that still incorporates the theme (tying up enemies instead?), or being put in new situations with new mechanics (leaning a bit more into the puzzle part of it all).
Just my two cents. The more bondage themed games the better!