It looks ok, but is pretty boring. There's no sense of progress.
Pretty simple, but nothing that sets it apart from most shoot 'em ups. It's at least functional and does't have any game breaking bugs. However, you should probably looking into the layering of the SFX, since the explosions are leaving the frame of the gameplay and it looks a bit sloppy.
Invest in having a good MDA for this shoot 'em up. You have aesthetic and you have a dynamic, but could be made more interesting with a good mechanic.
Look into expanding on the idea of what a shoot 'em up is and try something different.