Ventilation isn’t an issue. The entire run is hardware cloth and the top of the coop is also wide open with hardware cloth. The plastic roof is only to protect from the rain and provide some extra shade. This thing is basically completely hardware cloth all around.
You may change your mind come summer, though it looks like you have your access hatch in that wall facing into the run? If push comes to shove you can pop that open in hotter temperatures all summer, or as a temporary measure while adding in more vents.