Good concept, I have a lot of respect for this type of game, I can see all the though put into the UI and tutorial. I only made it to the 3rd level, I encounter one thing that happen once to me, in the first part when I was trying to shoot the platform If shoot the top platform first the below one doesn't active.
Still, in general I like it. I could see me trying again if move forward. Good work! (and nice art too)