Arrow keys to move... you can try to dodge, but you don't have to. This is only implementing movement to the boss, you can't take or deal damage. There is no goal, just mess around with and try out the movement. (358 blocks for this lol)
New update! Now it moves SO much smoother! What is this for? That's a good question. Oh, you wanted an answer? Well, it's for a little (actually pretty big) project I've been planning for a long time (like a year). I won't spoil the surprise for you though, but I will tell you that it won't be within scratch. They will have projectiles and other phases. This project focuses solely on the movement.