I got to 10t at 29:30 and NaN at around 33:30 but I forgot to take a screen shot of the layout, It looked really nice though
Also if you don't mind I have a few ideas that might slightly improve the game.
an interesting idea could be to make a sandbox mode, where the player has infinite money, and can play around with different layouts, in order to make an efficient design.
I would also love to see a quicker way to upgrade things. It's a really small change, but just being able to shift click on a box and upgrade it, or double click, etc, would be a really nice addition.