I'm open to either, i like the round one's look, but have a fondness for the classic square.. would like to choose whichever i'm in the mood for really...

and yes, we need Phases of the moon, round would probably look the best for that.
as each night cycles..
no moon
1/4 moon
1/2 moon
3/4 moon
full moon, then reverse it
3/4 moon
1/2 moon
1/4 moon
7 day cycles that would be ..

then on the night of the full moon...
all the special nasties come out to play too...
red creeper (blows up when he dies, period)
slimes come to the surface to duplicate.
wolves climb to the talest hills and howl (wild ones)
(tame ones would howl if you dragged them there)
abominal snowman, bigfoot, and pumpkinhead spider rider ...