Great job!
Overall, a very interesting puzzle with a lot of mechanics to explore!
Some form of a tutorial will be a great additional, I had to fumble around the keys to figure out how to play the game.
And the fact you could pause to destroy and build during the play stage was not conveyed as well, which is a awesome mechanics.
Also would be nice to retain the setup even when you failed, it's very tiresome to rebuild everything even though I was 1 block off.
Keep up the good work!