Great achievement for a single person. This is a real fun shmup! I got that it's inspired by Gemini Wing, but stage 4 looks very much like stage 3 of MUSHA (Aleste). Awesome!
High-Score saver is much appreciated, thanks for the update! Only the pause function is still missing, like in Neutron as well. Would be cool to have that too. Anyway, very cool game this is!