Hi, thanks for the mention and i'm glad the comments in my HTML files could be helpful to someone :)!
To restate them here, I used a HMTL5 port of RetroArch SNES9x core made by Toadking (https://toadking.com/retroarch/snes9x-next.html)
I set various options and modified the HTML page to embed a specific rom so it's easier to release a homebrew game on itch, so It might be easier to take my customized files and simply edit them and replace the rom file with your own game :).
@BennySnesDev: do you also have issue playing KeepingSnesAlive through HTML5 emulator on your computer? From the HTML5 SNES emulators I've tried, I found this port of RetroArch to be the fastest (I use a fairly low-spec / cheap pc myself too, and the game is running smooth for me).