Nice little experiement - thanks for joining the jam!
There wasn't any readout for the current state of the game or instructions - I think you could have included some instructions on the itch.io page as a bare-bones substitute (something to the effect of "start the game with enter, and then you'll hear a sound, press left and right to change your position until you hear the beeps fastest, then press enter, you'll hear a confirmation sound and move to the next round if you succeed!".
Ideally these would be read out by the game (either accessible to screen readers, or via text-to-speech), but often people will include details in the game page or other places when including all those details would be hard.
That being said, once I knew how to play, I had no issue completing the five rounds.
Thanks again for joining the jam and submitting this entry 👏