Did I misunderstand? Can you read the word superfluous in more than one way? English is not my native language.
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What a cute looking game! :-)
The background animations aren't superfluous when they help the game feel alive. I read that as you downplaying the importance of the animations, and that's not exactly a good way to present your game. I think ii would benefit the presentation to take the sentence out from the bullet point about interactive environment, and move it to the point about art style. It can also be rewritten to something more positive, like "The background elements are all animated by hand to bring life to the environment.".