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1. is a little bit small to be significant, consider adding more supportive elements to have a fleshed out story such as aesthetics fitting the story in your levels or changing the aesthetics of the game to fit the story with existing assets from elsewhere (be sure to cite)
2. This is also way to small and would not earn points on its own. Consider perhaps making new enemies that behave differently and look different from the provided ones such as bigger slower enemies that shoot patterns.
3. This is too small. Consider making another new set of enemies that behave differently and look different from the provided ones. Perhaps some fast ones that move in a different pattern from the current ones that run directly at you? or a set of enemies that move at varied speeds differentiated by coloring which you use to flesh out the challenges in your levels?