Repeatedly smashing things up is not the best way to restore harmony unless you are in a game. It's a good lesson to bear in mind, especially if you're invading countries because a man showed you some blurry pictures, and it certainly applies in Gurumin. Here your main concern is going around each of the areas you're in and using your magical handheld drill to break pots, pillars, rocks, bits of metal, trees, posts, bins, and of course faces. Every time you do, some money falls out, so of course you leave no object unbroken. After all, you need the money to make your drill better, and to buy biscuits.
It's less wacky than it sounds. A fairly straightforward mixture of 3D platform game and RPG, Gurumin puts you into the little red dress of Parin, who turns up in a mining village one day to live with her grandfather and subsequently discovers that her new home backs onto a monster world where running, jumping, whacking and collecting are the norm.
Following a bit of amateur dramatics (and we do mean "amateur", despite what the box says about an "all-star" voice cast), time skips forward a bit and we rejoin Parin and her friends the monsters, one of whom has been kidnapped by the Phantoms - weird blue nasties who are up to no good. Given a special drill by her new friends (who grown-ups can't see, obviously), Parin sets off to rescue him from, er, Potato Ruins. As soon as she does that, though, a Dark Mist descends on the monster world and monster village is destroyed by the Prince of the Phantoms and his shadowy band, all of which drags things into much more familiar territory: you have to set off into the world, complete 3D platform levels, defeat bosses, and return to town now and then to visit the bakery (healthy treats) and other amenities.