More Accurate, Zoomed In Rockets

If you find it difficult to hit the Striders (or any other enemy) with the RPG from far away, fire a rocket and immediately press [Zoom] (default is Z). You will automatically zoom in like normal, but will have control of the rockets trajectory. Like a laser guided missile!

Since RPG's are scarce, it might be worthwhile to save your game in an outdoor area and then have a little target practice.