Coming back to this after realising I didn't give it a rating the first time around. Even after watching the tutorial video a couple of times, I got stuck. I will watch again to see how it all plays out. Full disclosure, I didn't get past the 2 green gates.
Overall the performance on WebGL isn't great which I think adds to the feeling of slowness.
Personally I don't enjoy a lot of back and forward in these types of games. At first I didn't even realise I could pick the skull up off the first pedestal and move it to a different one. In that respect it felt quite "old school" and some people do like that.