It seems like it could be a cool if there was a movement zooid with an insect leg or tentacle that would get a sizable movement bonus if close enough to a wall to crawl along it.

It would offer some pretty different gameplay from most movement zooids, as you'd really have to pay attention to your position in order to make the best use of the zooid.

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Another thing that would be cool is a sort of 'servo' zooid. It would have two attachment points. One would be normal, but the other would automatically rotate in order to face the mouse pointer. Seems like it'd be great for all sorts of things.