Help identify online music game

I’m trying to relocate an online game I only played once, a few weeks ago. I didn’t note its name.

There is a ‘beam’ of light particles. The player adjusts circular ‘lenses’ that can re-direct the beam to hit what look like rectangular sets of bars. When you do so, each set of bars glows and plays one part of a tune. The player can only adjust the size and position of the ‘lenses’ that re-direct the beam (not the orientation).

Would welcome any help finding this again.

Auditorium, methinks.

Bullseye. Thank you.