Fun game!
My main feedback would be that I had absolutely no idea what I was doing. The word "Transitively" means nothing to me (You have to connect it indirectly?).
It would have been nice if you could have been able to see which connections are already made and which are not, cause it gets messy very easily.
Absolute banger of a soundtrack, and the input changing was nice to have, especially since right clicking is difficult in browser.
I did however notice a bug where sometimes the line I was drawing didn't want to follow the mouse? Hard to explain, probably something to do with it being in the browser.
Lastly, I found it slightly unintuitive that you had to press on a node to start a link, but hover over one to finish it, and it would have been nice to have a button cancel a link while drawing it.