Wow! You managed to create so much from a set amount of shapes - libraries, forests, you name it! I'm really impressed by that. You also fit the game in a clever way: only giving the player a limited amount of space on the planet is really creative.
My only recommendation is small: the menu style is a little drab; consider spicing it up with a little more color and simplicity. Also, one thing you can work on while the jam is in progress is to design a new thumbnail to attract more attention to your game.
That's it from me! This is a cool submission and uses the theme + shape limitation in a clever way that works well :)