Ah yes, making a custom web version was a huge pain until now. I just uploaded a kit with which you can make your own web version on the Dolmexica Infinite release page, it's called "Dolmexica Infinite Demo 12 Make-your-own-game kit for Web.zip". With that you can make both a zipped version you can upload at itch/newgrounds or just use the unzipped version to play it locally. There's a readme included on how to use the batch file, the rest should ʰᵒᵖᵉᶠᵘˡˡʸ just work. The file structure is like Mugen, adding characters works the same as with that.