Try to doge the Waddle Dee, if you get hit your damage goes up by 1, use the arrows to move, the left button is for jumping when facing left and the right button is for jumping when facing right. You will have to press see inside because the Waddle Dee will not move when it’s position is reseted so click the Waddle Dee’s top set of blocks. You get game over at 30 damage.
Myself.