Freaking cute.
First of its entirely adorable. Cute main character, cute monster-friends, and cute bad guys. There's a lot of humor in the game so it kept me smiling. Pretty simple but good storyline. Basically you're going through levels and beating up on bad guys with your drill weapon and saving friends and their furniture so you can rebuild their town.
You get to change the main character's appearance when you buy new items for her that protect you from certain types of damage, which I adored. My favorite thing was the cat-ears and the one I found most ridiculous was the gas mask because there's nothing like sticking a funny looking mask on a girl wearing a pink dress while she runs around town with a huge drill...
It kept me up until way too late playing 'just one more area' on school nights. Really the only RPG I've found I liked on PSP so far.