Is mutation system implemented properly?

So when I started my current and so far surprisingly long and enjoyable playthrough the crabmen all had grenade launchers. This of course decimated my snipers on occasion when I grouped them to provide overwatch for faster units to move ahead. Now they have mutated into having a melee claw which frankly causes me no problems at all. My point being. I see that at least crabmen mutate into different forms but is it related to the players actions or is it simply a way of testing out the various enemy types in this backer build?

No, right now it is just random.

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Yeah that’s what I guessed.