? ? ? They really don't fit.
earth seemed like a good element for making something alive that isnt generally alive to begin with.
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seemed like a decent upgrade progression (only other one i could do would be
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) and well the duckness was the only way i could make it all fit together. this is a bottom up design (come up with mechanics first, build theme around it) as opposed to the top down design i (and most other creators here) usually do