Great city sounds and sound effects as objects fly by! Also very nice colorful graphics. I am not very good at the controls, but that may be something personal. Perhaps use mouse for the IJKL side? But I can understand it is not that straightforward to replace keys with mouse, and keep the same way of flying. As others said it is quite difficult, perhaps because of the controls but even more so because of the stream of fast moving enemies. I think slower and fewer enemies could improve gameplay.