The UI and effects feel a lot cooler since the last time I saw the game. It has a lot of really cool game feel with when the blocks give you points. It would be nice if there was some in game indication of controls and how hard your shot will be.
You might want to remove the itch fullscreen button since it blocks the unity fullscreen button.
Restarting the game seems to prevent the canon balls from firing.
I'm curious, did you get to try the early play-testing iteration cycle you were looking to do?