Nice little game! The levels are effective at communicating new mechanics to the player, I found myself learning what each thing did very quickly. I found that the most interesting level was level 2.3, as at first, by pure visual inspection, I didn't realize that the path on the bottom was long enough to get to the end after I got the 8 fish. So, that level definitely played like a more subtle form of solving a maze for me, and I think that more intricate maze-y mechanics like that is probably where this game is strongest (as it is, of course, called "Ocean Maze").