Are you serious!
This is one of the finest games in the Game Jam presentation! You managed to correctly match the theme with the limitation.
Good thing you went and commented on my game otherwise who knows when I would have seen yours...
I loved the fact that the number of connections to make changes depending on the amount of vertices in the shape. I also liked the screen shake effect although it's probably a bit much but maybe it's just my impression. Also I think you should make the intro skippable so if someone loses they don't have to wait those seconds to start again.
Despite that, great game!