For the axes, when I put the blade on the "right" side so that they don't rotate, I only get a 66% score on construction. There's something wrong with this.
4-03 is way to hard, basically impossible until you max out the turtle and bomber. It's enough that you are stuck with turtles that can't attack and slow bombers, but all the lame ice and fire spells adds little to your firepower.
there should be a ship speed upgrade, since in many levels it's impossible for you ship to avoid getting hit because it can't outrun the bullets, and slow doesn't help either.
baby witnesses are too powerful, just one can take you down as long as it keeps stunning you, and if there are other monsters around it's really hard to survive.