Experiment in eliminating transparent white from LandPixels - I think it messes up on some graphics cards. Noticed a curious white border on a girder in a theme Randy is working on. At the very least it is slightly more efficient in the blit.
Little tweak to reduce noob fail. Delay drill rocket explosion by 250ms after spawn in Attack. Unless you drop it straight down w/ no power, it should not explode immediately in your face.