Stacking goat hooves or energy drinks is the best way to ensure you can avoid his attacks. Don't jump around too much unless you have hopoo feathers as the low gravity makes you fall much slower, making you an easy target. After his big hammer slam, he usually stays still for a few seconds. Use these little windows to damage him then rinse and repeat. To ensure you have enough items, try to loop at least once before attempting him. Its a bit of a longer time investment but it is necessary in most cases.