Great game! I have zero complaints for the gameplay and I love how many quick arcadey experiences are in this jam with the "control mirrored players" theme. This, Lonely Company, and Bit Break all come to mind. I think your execution might be the most effective of the three.
Graphically, it's very simple but it gets a pass. The only thing I would add is a death sprite. The main issue is the audio feedback, actually. Other than the jump, sound effects are very lacking. But I understand this was made in seven days.
Great adherence to the theme. Loved your logo at the beginning, by the by.