for the first level it helps if you actively minimise the shots below 10 :)
S'ing your C will then probably follow from it .. thanks for playing and the screenshot :D
I didn't quite get rid of the lagging issue .. it used to be the first loading of noise textures that created that, but even after removing all noise textures but the one on the staff the problem is still there -- optimising that lag away would be my first order of business if/when I return to this, so it scales nicely with plain more stuff in it :)