Probably not wrong but quite possibly in a way that's not been optimised well. I'm sure people on Freenode IRC #perl6 would be interested in your work. Don't forget `perl6 --profile script.p6` gives nice profiler output out of the box!
Maybe it'd be fun to hack on https://github.com/raydiak/pray?
It's remarkably slow right now.. It takes 1.5 minutes to generate an image. I tried to do the same thing in Julia and it takes 1.5 seconds. So I guess I must be doing something wrong!