for those who want the hard badge: look for breaking the wood by just 1 ball by rebounding it with another wall(wood,metal...) and you can easy get + in level 2,3,6,10,12 in stage 1 and 1,3,8,9,10 in stage 2 so with 40 stage 3 star and you got 130 stars (if you don't use hint that's it)
for me, a party of an old farmer with stable supplies of food and things,a girl and myself in a house in the middle of nowhere seems fine enough for a good ending