The game at its core is novel in nature, essentially subverting the SHMUP genre by asking you steer a boat with boatlike controls and fire at enemies with just a simple cannon. The pacing is a bit slow, but the core game ends up being surprisingly fun, because the game is balanced around this initial awkwardness; there's real genuine satisfaction when you learn the finesse of steering the boat and start downing enemies. The parallax(?) scrolling also helps to "sell" the immersion of sailing the sea.