Tom Create are no strangers to the Nintendo download scene having released a WiiWare "card battle" game and three budget DSiWare games last year. Earth Saver was the last DSiWare game from them in 2009: a puzzle game with a play mechanic very much like Namco's Dig Dug II, but a setting like a millennial disaster flick.
Andriasang: Tom Create released Earth Saver for DSi Ware in October of last year as a tiny 200 DSi Point download. Now the game is moving on up to PlayStation Network where it will appear as a ¥500 download on April 15.