that was the only part i've died at so far. i proceeded to get really angry and devise the following strategy:
i don't know if youre doing what I think you may be doing, but you don't have to be in hyper mode just to break his balls (hah). you can chip away at them with regular beam shots. first time around i would break one down, enter hyper and destroy it, and then get rushed by him.
take your time and break all of them first, then go ahead with the hyper beam attacking (also for whatever reason i took out the one on his back early the second time around, and things went a lot more smoothly). when he extends his hands to get new orbs, i'm sure you know you can destroy them before he pulls them back in.
as for the feet, timing is your best friend. right when he charges, you should be in morph ball form. run around behind him, blast his feet, and immediately unmorph so youll be ready to jump. key thing is to not be afraid to get too close. what ultimately killed me the first time is i was afraid of getting hit and none of my bombs ever did anything to his feet