I don't know if this is a bug or if I am missing something.
Once while playing Nero 2, I completed 7 of 10 shots. Then nothing was lit to shoot for! When play then turned to Player 2, who was just beginning Nero 2 (no shots yet completed), nothing was lit! We both shot everything we thought we could shoot for, but nothing seemed to be registering towards the 10 shots needed to complete the goal.