Two Enforcement Droids
At the end of the stage, two enforcement droids will attack from different directions. The one you should be concerned about is on the left, which is similar to the first stage boss; it shots are harder to dodge.
They otherwise follow the same tactics as the end-stage droids on Stage 1 and Stage 5. However, the heavier robot on the right has a slower firing rate than on the previous stage, allowing you to fall back if necessary.