My favorite part of this game was the pixel art for the portraits and scenes, however I found the actual gameplay pretty uninteresting. If the protection area were smaller with more room for enemies to spawn on the outside with different speeds there would be more room for different mechanics and management of approaching enemies.
The game was cute overall.
But on a more negative note I am not sold that this game fits the Jam's theme close enough. The announcement video implies water and the use of the color aqua seems like a stretch for me.