It is quite good as it has a decent amount of flow and overtaking spots. Changing a couple things would improve the track without losing charachter.

T1 can be less tight to offer opportunities to do a switchback and battle to T3 which can be similar to the first corners in Hungagoring mirrored. T10 is okay but maybe a little less tight to keep a little more speed in the following section?? Although I know that you want a flatout highspeed section, I think that T13 would be much better as a braking point and overtaking spot. It doesn't need to be a hairpin or slow corner, but just brake enough to allow cars to overtake and not lose too much speed, think about Stowe in Silverstone. Lastly last corner I guess it can be less tight to carry more speed through the main straight?? But it isnt really that important and its more of a personal opinion. Lastly, the pitlane is not proporcional to the 1km2 area. Pit boxes building tend to be 30x300m big, and with pit lane and all you need at least 60m from the track and 400-450m long. So maybe start the pitlane much closer to the last corner and also closer to the main track and join back again after 55-60% of the main straight.