[3] The player rotates a circular track with two coloured orbs, guiding the balls to avoid incoming obstacles.

[6] The names of the levels and the game's story are inspired by the stages of grief from the Kübler-Ross model.

As of August 2014, Metacritic lists a score of 79 for the game, a rating of "Generally favorable reviews".

[8] Critics praise Duet for its controls and design, yet noting its notorious difficulty.

In 2015, Tim Shiel performed the Duet soundtrack live accompanied by the Queensland Symphony Orchestra.