I like it a lot, a great idea coupled with really good graphics. You built an interesting world that shows potential to be expanded upon.
I noticed a couple of bugs: when you go to the controls options through the pause menu and go back to the game, the UI showing you objects you can place disappears. Also, in that same menu, I changed the place part action to Space and skip typing to E and could no longer place objects (using Space or left click or any key).
Great submission!