My wife (the primary playtester for Connect!) had an idea last night: color code the chains depending on the number of total remaining connections for the chain.
And here it is:
The unlit dead ends are the usual unlit red color.
The unlit non-dead ends are yellow.
The lit dead ends are the usual lit green color.
The lit non-dead ends are colored cyan.
Which puts me into an accessibility danger zone even more than I already was.
What accessibility danger zone? Color blindness. Right now, the game is harder for folks with red-green color blindness.