Nice simple game, good work. I got three suggestions: first, make sure the sizing of pixels within your sprites remains consistent across the game for a cleaner look. Currently the boat sprite appears to be a higher resolution compared to its surroundings, so it looks a little off. Second suggestion is I would give your levels another pass over to make sure all the tiles connect properly. I attached an image where I circle the examples of tiles that don't connect. Third suggestion is maybe add more sharks to the levels? Right now they don't pose much of a threat, and I think your game would benefit from some more difficulty. But hey regardless, good work!