Best/worst 100yen I've spent in a while. I can't stop playing. I love Lum. He's so cute. I even invested an extra 400yen to get extras and now the game is even more fun.
Basically darklings came and stole the stars and the light. Lum enters them when you draw the symbol on their heads and destroys them, freeing the stars. If a darkling touches Lum, you die. Big stars give you more time and you use little stars to buy stuff that'll make you stronger or just cooler.
Simple and addictive and I'm sure I've amused many on the subway with how animated I get when playing.