I would like to clone mechanics of an existing game, using the "Flying Along" template. I have added different gameplay features, such as spinning platforms and enemies, but the art style is very similar to this already existing game:
I'm using my own art, but can I face legal trouble if I publish a green-corridor, helicopter flying game?
As far as I know, you can be sued.
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gameplay mechanics and rules cannot be copyrighted. Actual game assets are... so you can copy any game you want as long as you use your own art assets and music/sfx.