The next iPhone game from Cave isn't a shmup, nor is it a music/dating game. It's kind of a strategy game, actually. In Castle Creator, you build a castle and the town around it, and then battle with other players' towns. Originally released in Japan on the GREE network, it's now headed to iPhone.
Siliconera caught the announcement on a recent Deathsmiles stream event, and then found the trailer Cave posted to YouTube (above). Before you watch the trailer, let us prepare you with the following two pieces of information: first, "Shirotsuku" is the Japanese title of the game, and it means roughly "Castle-making," and second, this is definitely the best trailer music you're going to hear today.