Looks really nice, unfortunately I'm not really into shmups ;-)
In case you should be interested in some technical feedback using the demo version anyway:
On Linux the intro video doesn't show, only a white screen can be seen instead. This is a known problem with the Unity Engine which doesn't support MP4 videos on Linux. See https://docs.unity3d.com/Manual/VideoSources-FileCompatibility.html for a list of supported formats per platform.
I'm also having a very strange problem with my Noname game controller - it only works in the options screen (but not when trying to assign new buttons). It seems that you are using Rewired: that library has only very limited controller support out of the box, see https://guavaman.com/projects/rewired/docs/SupportedControllers.html#controllers... if you wanted to have general support.