Looks fun, unfortunately I generally don't download and install software from unknown sources, so I won't be able to try this one out. A bit of research suggests that UnrealEngine 4 has some Web based building capabilities but that doesn't exist with UnrealEngine 5 unfortunately. Not sure which version you used, but it might be worth looking into using the older version for Jams to have a web build. Or perhaps building it with both? I'm not really sure how that would work though as I don't use Unreal myself.