Nice job ! I've tried with a hiking GPX. It works pretty well and the sliders to adjust the settings are great. However, I'm seeing weird vertical lines on the map.
Ugh, yeah, that's a bug with Mapbox itself.
I need to update to their latest version but it comes with some downgrades for me.
Thanks for bringing this to my attention. It happens rarely but it happens -- and I need to fix it. Will focus on this soon.