Nice quiz, just that the Canaries (though we have our flag emoji 🇮🇨) and Azores are not strictly overseas dependencies, just provinces like Hawaii is to the US. With this criteria, other countries like Ecuador (Galápagos), Colombia (San Andrés) or India (Andaman & Nicobar) could be included here.
BTW for Spain Ceuta and Melilla could be counted too.
Niue and the Cook Islands are States in free association within the realm of New Zealand. The Cook Islands and Niue have full constitutional independence from New Zealand and act as independent countries. But it is New Zealand responsibility to defense and foreign affairs on their behalf. as well as that anyone born in these territories is considered a New Zealand citizen.
BTW for Spain Ceuta and Melilla could be counted too.