Hi Bashudev.
Good effort on your project.
Although the colours that you used on the buttons are very consistency, the text's colours are not, you should use same colours for both menu scene and game scene.
In addition, using different fonts and sizes for the tittle 'ocean world' in the menu scene, does not make me feel comfortable in a player's role perspective.
On the other hand, the background image of the menu scene looks amazing however you did not use any for the game scene, the green object does not make me feel I'm in an ocean topic game.