Duet, developed by three-person studio Kumobuis, is a classical arcade flyer that has some elements from the 80s with some modern twists like invisibility and parallax. The player controls two vessels, and the aim looks simple enough – survive. But the vessels are in sync- both are tethered together in a circle with one vessel on each end of the diameter.
As Tom Greenaway from Kumobuis notes, it has been on and off development due to work on other games. They are, however, getting positive feedback and gauging feedback on what platforms should they distribute the game (e.g. Steam).