Nice thematic approach to graphics and styling. I love Pacific and Atlantic as different game modes, cute little detail. A tooltip or text in the shop would be helpful to indicate what each item does. Also the gambler item is probably not needed in the shop when user is in Pacific mode.
Sound is nice, but mixing is inconsistent and negative feedback noises spike excessively loudly.
It's not quite clear to me what lets you shoot again, and the graphics are inconsistent on this. Sometimes clicking does nothing, sometimes it shoots and sometimes it loads the graphic of a projectile but doesn't shoot it.
Overall, very well done shows signs of smart scoping - you've deliver something complete, thematic and polished, with some depth to it.