>>3332165I remember hearing about some pixiv users making their own games but it was just for a couple of their favorite swords and not a fighting game. If you are familiar with roguelikes you can mod Elona, there was a pixiv user who made sprites for the like the first 40. If you are looking for newer swords you would probably have to make your own sprite though.
Personally I would love to play a srpg type game like FE and also a side scrolling beat-em up game like Streets of Rage for Touken Ranbu.