Great game!

I humbly suggest that you flesh out the rules just a bit more. I struggled to figure out if pipes were allowed to run out of bounds, whether they all had to be connected into a single network, and the significance of the bulb-ended ones. I'm not totally dense and could make some guesses, but this still made the puzzle less than approachable for me at first. Basically I just guessed at these things, tried to see if I could solve one, and once I did and saw my complete solution all was clear. But why not state these things up front? Or maybe that's part of the puzzle? :-)

My first solve took 9min, then 3, then 1.5min for my third.