To everyone having problems defeating the Ancient Fear on Hard, this is the build I used:
Marco - Spirited Bullets and Concentration maxed, the rest on Headshot
Simon - Cleansing maxed, the rest on Concentration
Angela - Diamond Shot maxed, the rest on Concentration
Last Flake - Bite maxed, the rest on Concentration
Jake - Tiger Claw maxed, the rest on Concentration
That is it. I t will be a bit luck based, but very strong. I won in my second try.
The ultimate guide to the Kamikaze badge:
1- Get the last ship unlocked (go to easy difficulty and get a 100x multiplier)
2- Go to the game options and turn on the first three extras (it will help you dodge)
3- In the survival bonus stage, forget the money. Try to get as many close kills as possible, so your multiplier is around 35x-40x
4- Fully upgrade the laser wingmen or the electric wingmen, they are both fine. Buy only Kamikaze and Commander cards (do not buy the courtesy ship, the hitbox does not get smaller). Spend the rest of the money in the wave weapon.
5- Now focus on dodging and good luck :)
you can beat the game very easily using only Hood the Rabit. Keep upgrading him to max, get only food production skill and xp increase skill. equip yourself whit a food ring and a xp ring. Piece of cake, did it myself
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that boss then has +100% DPS