Let me just say, this game is a good concept for what it is. At first when I got it I was expecting something like Fez, and that's what I got as a matter of fact... the game gives you that feel and atmosphere that Fez gives. It's almost creepy in a way, but I like that.
You start off in a room which shows you the digging mechanics and, if you dig enough, a simple little rhyme with the names of the developers underneath it. After that, you fall onto a platform with little heart-filled blocks, which give you the "seeds" of the game, hence the name. When you enter the "first" area, (I'm not quite sure if it's the first area or just ONE of the areas to be honest) you get 10 of those seeds. The seed blocks seem to be the first you get everytime.
At first, I thought the goal of the game was to simply plant as much as I possibly could, but then I noticed the giant blackish void infecting the blocks. I then thought I had to outgrow the void and simply get away from it. Obviously, I died, but when I died I entered some black zone. This zone keeps track of the blocks you previously placed, and inverts the air and the blocks to make a sort of jumping zone that you have to grab items in.
To be quite honest, I'm not sure what the keys even do, I managed to grab one, but it didn't unlock anything that I could visibly see, nor did I get any items for grabbing it.
My breakdown is that the game is for those who like to figure out challenges for themselves. If you're expecting some puzzle to be presented to you in it, you've got the wrong game, but some people like that sort of thing. Other than that the sounds are quite pretty, but unfortunately cosmetics don't make up for something that just isn't very much fun. I wish I had the drive to play it further... sadly though I don't.