fair enough. may want to put some thought into changing the theme a bit, genes are rather miniscule, and gravity has little/no effect on genetic expression, may want to find something more befitting of gravity, and i dont suspect the average mass of a genetic engineer will differ much from that of the standard population, so there may be something more befitting of gravity.
as for the mechanic, i dont dislike it, but i do think categorizing each card in each element will be rather tedious, unless you just lump them into cost ranges, which reminds me of gecko, which i was told was too complicated for people to comprehend.