wee I did it! heres a tip, keep attacking him with blue all the way. if he is gonna beard attack you, only with blue move away. if not keep doing it, when he is going to shoot his lazor, attack him, mostly the lazer shot before the one of the bread attack, where he only does two lazers and then follows you again. THere attack him before he shoots his lazer, I did a +27 combo and from blue, turned to red with half. Half hp gone, max time I took was 20 secs. Never use magic till golden/rainbow. Just in few cases with red. But never use it with blue or green. Well that was my combo to win. I ended with lolipop because I kept one grave on the middle and attacked it till 950. Loli does a lot of damage and combo.
on the third wave I died and got the survivor badge... there must be a glitch, besides the hard is before the medium on order so... theres something wrong