Best strategy afaik:
First eat the bugs before collecting the clay,
Then, stay in beast mode, only fire at the mother when you're sure that you're gonna hit her,
Stay low and close all the time, the attack of the golem dashing at you is VERY predicting, he alerts you a while before attacking,
When the mom is shot, just go to energy form and button smash the ctrl button, while still using the same stay low strategy, just be a bit higher seeing you're not as fast anymore, or use food.
After about 3 times of that, the mom starts spamming bullets, just keep moving at the top now and stay far away while still spamming the ctrl button.
Is how I did it and I didn't use a single food item. On my second run that is, also that I didn't have any health eggs. =p
I think I got hit twice though.