lvl 60 last boss I found using energy homers, 4 homings and lightning effective. Use lightning whenever it's charged, use energy homers when the boss is stationary (cursor towards him, so when the worms come out it aims at them automatically), use 4 homings when dodging all the bullets but ensuring maximum attack
for those finding the game "too hard", the first 3 badges are relatively easy, it's a matter of "Deal or No Deal" just knowing when to cash in your trophies. the impossible badge I'm still working on though
really hate the randomness when the bowmans and the chickens attack, maybe a "redemption" shot to shoot out the egg or arrow before it reaches the castle???