The random number generator is a little too random. I know that sounds nit-picky, but I like things better when there aren't 50 decimal places floating around. Possibly make that an option? Decimals on, decimals off?
I have no idea what to do with the last boss, and after reading some other comments I don't wanna spend half my life figuring out how to. Cool game, but the last boss is pretty suicide-inducing. 4/5 because I love typing games. :)