So, I love the art and the music but damn does it get chaotic fast. I know this is just a demo but the pairing of the somewhat odd focus fire mechanic that slows your movement and the huge number of large projectiles I found it difficult to avoid damage a lot of the time, especially since it ramps up so quickly. Maybe the different classes are going to have somewhat tweaked abilities but when I think of a shmup game I usually think of smaller objects on screen with high mobility and a focus on continuing fire while avoiding projectiles and picking up power ups to kill the increasingly difficult enemies faster. Holding fire to swap back to a spread shot feels really unintuitive and somewhat frustrating. I like the risk/reward mechanic of brushing projectiles for extra charge but the immunity mechanic feels strange as well. If it were balanced differently as to being more powerful but really difficult to charge I think it'd feel more rewarding to use rather than a necessity to build charge asap just to stay alive.
I actually kinda like that the special charges quickly and saves my life a lot... even though that means I never use it. So basically I can see where you're coming from even though I like it as it currently is.
I also think with the current way, using the special could still be valid for a player with a different way of playing than me, since even though the special isn't that powerful, it still gets rid of bullets in front of you and can be used quite often. It makes this game different from many bullet hells, but I like that. :)