It took me a while to figure out what I was doing, but I did eventually figure it out. It was fun at that point, and really satisfying when I figured out how to add multiple ingredients to make something. I did run into a few problems, though.
One thing was that as soon as you clicked the button, it was bought, and you couldn't undo. I feel like it would've been more user-friendly if instead it wasn't bought until you actually place it. I liked the option of being able to move pieces once placed, though the buttons for that were touchy. Sometimes I had to click a part multiple times in order to get the move buttons to show up. Something like clicking and dragging would've been nice, too. Being able to place pieces underneath the buttons was also a problem, because it was difficult to get to them after that. It would also help to state somewhere that you can rotate with right click.