Awesome job with this! I've always loved the ancient arcade classic "Galaga", which I think is safe to classify as the great great gran-pappy of all space SHMUPS. This game not only reignites the nostalgia of Galaga, but also incorporates a healthy layer of complexity onto that simplistic, tried-and-true base formula. The variety of different enemies, alternate weapon option, and full screen mobility bring this more or line with SHMUPS like the "Raiden" series which I also enjoyed immensely. All in all, I think that opens the door to allow for more skillful player maneuvers, and an overall fun experience; definitely a game you could sink a fair number of hours into!