Game fits the theme really well. Having two characters to move and a timer really pushes the player to control both at once instead of one at a time.
The only level that required players to control them "un-mirrored" was level two which was something I quite liked, it twists your mind a bit. A suggestion, if more time had allowed for it, would be to make level 2 actually be level 4. You'd be very used to running the characters mirrored by that point and it would trip you up a bit more. A level 5 that is even more complicated and also un-mirrored for level design would be a nice next step.