DrunkenGod said it perfectly
The game is a lot of fun and very nicely made, but the problem DrunkenGod pointed out is spot on. I could very easily make much larger towers, but am unable to because of how the mouse centers on the block when you click on it, and if you try and place it towards the very top of the screen, it will not let you. If you included a manual process for scrolling the screen up or down (W and S would be perfect for this), then we'd be able to improve our scores dramatically. That issues is the only thing keeping me from giving this game perfect marks.