I think this is awesome. The colors are garish, but also, totally 80s nostalgia. I think this is creative and fun. I just have two small suggestions:

1. If I click a window, it gets brought to the front. Awesome. if I click it again, it gets sent to the back!! Not cool.

2. Consider holding off on getting me to buy you a coffee. Having that popup upfront, before I've had a chance to explore the website, doesn't make a lot of sense. Consider displaying it after 30-60 seconds, and adding an icon to the dock.