First version of the White King Boss added

Hey! The first version of the BIG BOSS is finally published! You can try it (if you are persevering enough to find it)!

I also added a feel minor updates to improve the game feel:

• Now health bars for the White Pieces are shown when the piece is hit;
• A small camera shake occurs when something is hit by the player slash;
• Now the jumping movement is maintained as long as the jump button is pressed, so it is no longer necessary to press it repeatedly to continue jumping;
• Size and speed of the text for damage amount that appears when something is hit have been adjusted.