The maker of Candy Box is named aniwey (with a lower case a.).
He is 19 years old and lives in France, He made the original Candybox using JavaScript. He is releasing a sequel: Candy Box 2 on October the 24th when he is going to a game festival), he has stated some spoilers in his blog. He uses Twitter, not Facebook, and his email is aniwey@gmail.com.
The Developer is also a boss in the castle. He throws magic at you and if you attempt to erase it using a spell, you get killed. A message comes up that says, "Eh, he is the developer after all".
Boss info
The first text, "HELLO", is made of magic balls that deal 20 damage per hit.
The second text, "I'M GLAD YOU MADE IT THIS FAR", deals 32 damage per magic ball.
The third text, "<3", deals 9,999,999,999,999 damage per magic ball.
The Developer has 1,000,000,000 HP, but takes 60,000-70,000 (random) times base damage.
If the player uses black magic, Black Hole, or Erase Magic, a black hole will be formed at the player's location, dealing 5000 damage per hit. Teleport can dodge the Black Hole, but spell cooldown prevents Teleport from being used right after another spell, so it can only be used after your own Black Hole. The Developer's Black Hole will damage himself.
The Developer drops 6,000,000 candies upon defeat, and logs the message, "You managed to beat me. Congratulations :)".
Strategy
Black Hole
Overview: Cause the Developer to cast Black Hole while standing next to him, and then survive the Black Hole long enough for the Developer to die from it. Requires >2000 HP and Enchanted Knight's Armour, or >1000 HP if also using Turtle Potion. To trigger his Black Hole, just cast Erase Magic, Obsidian Wall, Black Demons, or Black Hole.
The Developer takes damage from his Black Hole at 30% to 35% max HP per tick. That means it takes three to four hits for him to die from it. The less HP he has, the more likely he'll die from 3 ticks instead of 4. At 90% HP, he'll always die in 3 ticks.
If both the Player and the Developer die at the same time, the Player wins. Therefore, the Player must survive three ticks, possibly dying on the third.
Surviving three ticks
With Enchanted Knight Body Armour, the Player takes 1000 damage per tick instead of 5000, so at least 2001 (current) HP is needed. With the Armour and Turtle Potion, the Player takes 500 HP per tick, needing 1001 HP. With the Armour, Turtle Potion, and 1501 HP, the Player can live for 4 ticks and guarantee the Developer's death.
Two Health upgrades with heart pendant, heart plug, and at least 793,653 candies eaten will result in >2000 max HP. Even with max HP from eating candy, more Health upgrades won't allow surviving more Black Hole hits until the 5th upgrade, but they allow the Player to hit the Developer for a longer period of time.
Teleport
Instead of tanking the damage, the Player can also Teleport away from the Black Hole. The only way to do this is to cast your own Black Hole and immediately Teleport away, hoping that you don't teleport into a Black Hole.
Damage strategies
These are builds that players have contributed.
Melee: Turtling
First, enchant as few items as possible throughout the game. This is so you can make as many pains au chocolats as possible. put AT LEAST four into getting "more power" as this gives you an 80% attack boost. Put any remaining pains au chocolats into health. Ignore magic for now. So long as you have the claw that gives you a *2 boot to attack power, and an unenchanted knights armor, and the scythe equipped, brew up a couple turtle potions and take him on. (For hardmode you'll want the Giant Spoon of Doom instead of the scythe.) Take the turtle potion as soon as the first wave is about to hit you. Waste any time jumping or you might take too long. Deadly third wave is deadly.
Do not equip the enchanted armor! This will leave you with too little attack power to kill the developer before the third wave hits you!
Melee: Cloning
First, get two pains au chocolats and use them for health and attack. Be sure to be at max health. Equip the octopus's crown with jaspers, pink enchanted gloves, scythe, rocket boots, and knights body armor. Be sure to have the unicorn horn and xinopherydon claw, as these are essential. Begin attacking the developer and squeeze. Then use a cloning potion and jump to the highest place possible. Use a turtle potion, and then a berserker potion and before the second wave hits the developer should die.
Melee: Companion tanking
Equip the enchanted summoning tribal spear, the Octopus King crown with obsidian, the enchanted Knight's Body Armor, the pink leather gloves and the boots of introspection. Drink turtle potion before the first and second waves hit, and drink health potions constantly through the second wave. Teleport constantly through the third wave until all the magic balls in it have been used up killing the octopodes and tribesmen that your equipment is spawning. You are now free to destroy the developer (just remember not to use any spells that will trigger a black hole).
No longer works. Companions just fall through the ground.
Melee: Spoon
Equip the Giant Spoon of Doom, the Octopus King crown with jaspers, the unenchanted knight's body armor and the pink leather gloves. Be sure to have the unicorn horn and the xinopherydon claw. If you have enough health and attack gifts, the developer should die before the second wave.