Interesting. Did you play the downloadable Postjam version of the game or the web-version?
I did experiment with faster connectors & aimlines in the postjam version - if you haven't tried that - I'd be interested if you feel like it's an improvement or not.
In terms of tutorialisation - would you have prefered a textprompt which say something along the lines of "Click your left mouse button to disconnect connector lines!" ? I thought it was quite clever to have the second obstacle requiring the use of that mechanic - but maybe it was too subtle/ forgettable?