Overall, this was stellar. It took me a second to really understand the linking between the nodes, and then towards the end I saw that it was on the cards. It was probably a "play before read" type of thing.
The same applied to navigating with WASD and rotating with Q and E. Once I figured that out, it helped me see how the nodes connect.
I always enjoy a good tower defense, and I liked your progression of going from one path to two paths, two gates, and so on. Nicely done. Keep up the great work. Cheers!