This is such a cool concept... The tutorial was very appreciated as I was quite lost at first, but got pretty blown away when I understood how the mechanics work. Atmosphere fits quite nicely.
Dash is broken in my browser (could be the doing of the omnipotent shared array buffer), although I don't think that really hurts the experience too much. Not a lot of places where I felt like I needed to dash.
The switching bullets for different enemies was good and made things a little more complex. I do however hope you develop this idea further after the jam into a bigger experience and narrative. I'd be interested in seeing where you're able to take this!