I agree with Wokko that the eyelessness makes creatures (even the non-humanoids) harder to distinguish as such. If this is a stylistic choice, it would be nice with an alternative version with eyes, unless of course this would be too much work for it to be plausible.
Otherwise this all looks great (been looking forward to a sneakpeak like this), my only irks are that void-tiles look a little to solid, and that downslopes don't look like upside-down upslopes, but the latter is probably just a matter of what you are used to.
How do FBs and other random beasts look by the way, do they take the shape of a differently colored standard creature, or are they controlled by some different ingenius mechanism?