Thanks for the comment! Love hearing ideas about how to improve the game. Totally agree on the contrast issue. This is something that looked okay on one display and I have noticed on other displays that it is definitely not okay and just haven't been back around to tweak it. I'll try to remember to take another look when I next circle back to this project.
Some of the limitations around editing lines are in the game by design as part of the "realistic retro PCB design software vibe." So this is sort of intentional, but I do get that it can be frustrating and might not be for everyone.