When comparing oO vs Duet, the Slant community recommends Duet for most people. In the question“What are the best Android games with only one gameplay mechanic?” Duet is ranked 3rd while oO is ranked 13th. The most important reason people chose Duet is:
Duet does not require an internet connection for the game to be played, making it an ideal game to play when there is no internet connection available.
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Pros
Pro Variety in levels
Each level has it's own look and variety of obstacles.
Pro Great game for masochists
oO is hard, extremely hard. Man y many retries will be used but in the end each level is frustratingly fun.
Pro Can be played offline
Duet does not require an internet connection for the game to be played, making it an ideal game to play when there is no internet connection available.
Pro Simple yet interesting graphics
At a first glance, the graphics of Duet appear rather simplistic, but on closer inspection one notices how much detail there is, from the moving background to the high resolution support.
Pro Can be played in the player's preferred orientation
Whether the player prefers playing in portrait view or landscape Duet supports it.
Pro Supports immersive mode
Duet supports immersive mode on Android devices that are on 4.4+ (KitKat or above). Immersive Mode allows you to 'hide' the on-screen navigation buttons and the top status bar in order to get a full screen experience.
Pro Excellent soundtrack
The soundtrack for Duet was created by composer Tim Shiel and matches the game graphics perfectly.
Cons
Con Precision perception feels off
The precision needed to execute very exactly time moves is sometime hard to judge, resulting in death.
Con Extremely difficult
Even though the levels are only 20 seconds long, the difficulty of each level is so high that it takes several attempts before a stage is completed.