My broken record is I want whatever theme it fits best, a "Khet" based objective.
Say 4 Stepper motors, 4 to 6 positions, that have a mirror on them.
One needs to get 4 mirrors aligned, and the laser lit, for it to successfully bounce its way across the playfield.
Of course, the wrong hit, and the mirror moves out of position.
Features like Lock Mirror, or Align one mirror as a reward.
IMO, it would add strategy, and a neat "toy" not done before. Very affordable.
Would look cool lighting through Green Laser in a Matrix Game.