But can napalm be efficiently deployed on every inch of the enemy's planet from space, because I want the sky to weep tears of fire, the seas to be filled with waves of fire, the ground to be a infernal hell-fire, and the very air to scorch the life out of any who dare to breath it
Napalm would probably be a more effective means of attaining your desired result than a nuclear weapon would be, simply because a nuclear blast is never going to cause the sky to "weep tears of fire" or fill the seas with "waves of fire." The first of these implies the presence of significant amounts of discrete blobs of burning material, which would be more convenient to create with dropping some form of incendiary than by dropping a nuclear weapon, and unlike the nuclear weapon you can theoretically sustain the rain of burning debris for a very long time. The nuclear blast "just" creates a big cloud, possibly with sufficient burning material to fulfill your wish (though I doubt it), and then it's over fairly quickly. Filling the seas with "waves of fire" implies the addition of a flammable material, such as oil, to the surface of the seas and igniting it, and napalm or a similar incendiary will work for that; the other interpretation of turning the seas to fire would imply adding something that combines with (salt)water in an exothermic reaction. As far as turning the ground into an infernal hellfire and causing the air to scorch the life out of any who breath it, these seem to be much more within the realm of standard incendiaries than in the realm of nuclear weapons.
Furthermore, if you really did want to deploy a weapon on "every inch" of an enemy planet, napalm would be a significantly cheaper option than a nuclear bomb would be.
A further option which could produce similar results would just be to drop a large asteroid on the planet. This would most likely be considerably easier than either bringing a sufficient number of nuclear weapons into play or saturating the planet with incendiaries, as there will most likely be a large number of suitably large asteroids in any given star system, and the only required investment to deploy it would be a number of the space equivalent of tugboats, or perhaps a bit of time spent strapping engines of one form or another onto the asteroid. None of these choices would be terribly useful if you were planning on colonizing the world afterwards, though the incendiaries probably produce the smallest number of long-term issues (though if you really did consume the world's atmosphere in a fireball, you might need a spacesuit or an enclosed habitat for any potential colonists for a very long time; nuclear weapons and asteroids would have similar problems, in addition to the radioactivity issue of nuclear weapons and the damage to the planet surface caused by a large asteroid impact).
I just want to slowly watch the flames burn over the enemy planet. What weapon could do that. Just "scorched earth" a planet
I get to take away all the air the populace is no longer using and I get to cool the planet! Its a win win for everyone!
Look up "fuel-air explosives" or "thermobaric weapons." Conventional incendiaries would also work, particularly if you want to watch the fires "slowly" spread across the planet.
Yes, you are.