Hrm, I can increase the range of its attack, or reduce the rock cannon's.
I'm glad you enjoyed it. One rather unfortunate thing is that most people complain about the difficulty being too high. The tunnel, for instance, took two revisions before stopped their complaining (the only actual changes were the platforms, which were lenghtened, and the shooting enemies, which were more numerous. And a few other things I forgot. I think some paths were made easier and extra platforms added in the first area. Have a look through some of the older posts in this thread to see what I mean.
I haven't worked on this for a few weeks but I think, when I'll resume, I'll quite watering it down for the sake of less experienced players. I find it relatively easy, and after some of the more recent comments and that rather impressive 3hp run, it's obvious I'm not the only one. >"<