WASD to move, aim with mouse and click to shoot, you can press E to enable autofire.
I made the boss music myself on Beepbox, since a lot of the fanmade bosses on the Diep.io wiki have 8-bit music! Updated 28/4/2020: Now he holds on to the same attack less, and when invisible, makes a sound before he fires a bullet, lasting based on distance, and drones now appear out of the back and are slower, but it is harder to destroy more than one with a single bullet, and when invisible he flashes before firing them. He is also faster in phase 2, and in phase 3 he's much faster when firing the bullet but much slower when shooting the drones. but no longer telegraphs his attacks, and his drone attack now shoots smaller, weaker but faster drones, and his bullet attack is slower, but if he hits you he fires instantly again. 12/11/2022: Fixed instant player death glitch in the final phase caused by him hitting you with bullets right where his cannon is, causing him to fire an infinite amount of bullets to obliterate your health. Now there is a 0.25 second delay before the bullet attack can fire another shot after hitting you. Note: It still does a whole lot of damage, it just doesn't go FSSZZZZ *you die*.