Whack that flag like crazy unless you want laggggggg! Use WASD to move. Use space to block. Click to shoot. Press C to use a smaller shield that can knock back the boss's projectiles, allowing them to still damage it. Avoid the boss's projectiles. NO HITS ON THIS ARE IMPOSSIBLE! 200 HP for the boss.
Music is from JSaB 636 Blocks - About 3 Hours It was so hard at first that it took me around an hour to get the hang of it!