I'd echo that "what am I even aiming for" was an initial confusion for me as well. The targets are pretty subtly styled and it took a few rounds of looking to realize it was already there. Also found it confusingly visually similar to the matching-brace/paren/bracket markers. And I'd say I have sharper eyes than most. I imagine even mildly color-blind people will struggle.

Changing to a more distinct color for the targets could already help a lot to improve on those parts I think.