You are the tug — small, fast, and strong. A ferry comes in under her own weight; shepherd her through the harbour and lay her against the quay. Push the bow to swing her, the stern to check her, and boost to shove hard or dart across the water.
Co-op is one keyboard, two crews — left hand on WASD + Shift, right hand on the arrows + Shift. On a phone you can still take the solo run: drag to steer, tap boost to surge.