Congrats on the submission! The idea of playing two 'reflected' characters at the same time fits the theme well. While other similar games usually depend on exploiting level geometry to 'desync' their movement, your added action to switch to one of the two reflections for a brief amount of time is a nice unique spin!
Since this is a platformer, I think the controls could be a bit more smooth, but overall good job, especially for working alone!