Yo, a couple of things:
-Music would have really added onto the experience. On next jams try either collabing with a musician or using free online music (Kenny is a good website I think) if you don't want to make the music yourself.
- It seems like you are using Unity right? For WebGL you *must* set the compression format on Publishing Settings to "DISABLED" not Brtoli, "DISABLED"; that way you don't have to set the game as a development build.
(if you need help changing this setting my discord is galse22)