I thought I make a thread for Starseed as it seems like a game where internet discussion is going to be key to figuring stuff out. The game itself is very reluctant to tell you what to do, similar to Fez in a way, so hopefully this thread can be useful for duders. I'm not sure how this is going to work in terms of spoilers since a lot of the fun of the game seems to be figuring out what the hell to do, I guess you could give a brief non-spoilery description of your hints/advice and put the hints in spoiler boxes? I dunno.
So to kick it off the main objective of the game (I think) is:
To collect keys, which appear as stars in world 1, these unlock doors in world 2 which lead to world 3. By collecting keys and going through the doors you can bring your seeds into world 3.
What you do after the bit I just described: There are platforms above you where you can find new "respawn" points, poetry and dudes. The dudes each appear to have their own special abilities.
World 1=The world that you spend most of your time in, you start on a mound of soil being chased by the black funkiness.
World 2=The black and white/inverse world.
World 3=Where you start, there's lots of poetry here.