This is a really good game! It's so polished :) I love the electricity animation. The gameplay was simple to understand but easy to ramp up in difficulty. The transitions between levels felt so smooth as well.
Personally though, it took me a while to realize that there was an end node required. Maybe make the end node more obvious? It has some designs right now but I think it's too subtle.
I can imagine this being a mobile game! Cheers!