To be clear i tested the Jam build first just to see the initial relase, but from what i see you've already started fleshing out the game more and it loks even more cool ^^
But anyway, i really like the art and music in this, and the controls are spot on for a classic shmup.
My initial impression the only negative was the very short length but like i said above this is already irrelevent cause you started to add more already :p
Really cool game and i'm curious to see more of it, good job you guys :)