Hi, thanks for your feedback! xD I included the error sound as there were so many things you could click but wouldn't build a bridge, will take what you said in account and may remove them & find another way to convey the message better!
Yea! One way could maybe to make a visual cue to show when the mouse is over a good place to put a bridge or something! The main reason why I didn't like the error sound was because it just reminded me too much of my own wake-up alarm so it really stressed me out lol
