Use the arrow keys to move. It is not a bossfight, only some AI coding.
Credits to @SerialGamer for their project Terraria:ALL Sound Effects https://scratch.mit.edu/projects/132002305/ for roar sound Also credits to whoever made the picture at https://www.deviantart.com/tag/eye_of_cthulhu for the Eye of Cthulhu images. And credits to the person that made the image at http://pixelartmaker.com/art/81f000a55236dbd for the Servant of Cthulhu images Credits to wherever it was I got the background and music.