The lack of other audio was deliberate, because I wanted to interrupt the music as little as possible. But now that you mention it, a sound indicator when placing a pole and if it connects to something would have not been too bad and would help a lot.
Adding the amount of poles used is also a good idea, as is a restart button. I'll add those to the next version, once the voting period is over.
Thank you for playing and for your feedback. :)