If you can't take valid criticism then don't claim achievment, you'r not finished yet . Its a fashion these days to pat yourself on the back before its finished but it still ain't right.
Um...It kind of is done..
The goal was apparently to create a Mouse-Controlled turret with a laser pointer, and the OP has succeeded. Personally, having no knowledge of Processing, I find it fairly impressive. It is listed as "Average Difficulty", so you can hardly expect perfection.
You can't honestly tell me that you've never completed a project, and then realized it would be cool to add something else.. That's simply what the OP was implying; ideas tend to hit you whilst building (or afterward), and those are just improvements upon the original finished product.