Planets should be larger, And spherical, Such as http://i.ytimg.com/vi/LWPk5zlKAEM/0.jpg but actually large enough to have significant flat areas. If the size of these planets are prohibitive, I have another idea, Which could both be implimented. You could chose the planet type prior the universe generation. http://pcmedia.gamespy.com/pc/image/article/121/1213830/minecraft_blogroll_1321645668_1322849620.jpg
This would be my other idea, To be large and circular as they are now. Although, They should be much larger, And thicker. The gravity should extend upon all sides of the planet, So you could walk along the sides, And the bottom. Which would have vegitation as well.
This would be my other idea, To be large and circular as they are now. Although, They should be much larger, And thicker. The gravity should extend upon all sides of the planet, So you could walk along the sides, And the bottom. Which would have vegitation as well.