Good job, I can see you have put effort in this! I have a few suggestions on how you could have improved your game:
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Another element to the gameplay that allows it to be less repetitive would have been nice, for example different types of zombies, powerups, waves, collecting munitions…
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The text’s font doesn’t look very good, maybe try using another one?
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There is no visual indicator of the progress of the zombies (or if there is it is too hidden as I’ve not seen it), it would be cool to have a healthbar or a breaking animation on the barrier to see how close they are to winning?