Interesting idea! I have a similar game — I'd be grateful if you could check it out! Here are a few issues I noticed:
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The syringe boss sprite looks blurry — maybe you forgot to set the texture filter to "Nearest"?
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On level 2, the game just froze with a message saying "2 enemies left".
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The camera doesn’t have boundaries at the edges of the map.
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As others have said, a web export is missing.
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The enemy-player collision hitbox feels too big.