be careful big is not always better. I personally use smaller levels to force myself to find interesting ideas for puzzles. If its done wrong it can lead to levels that you understand what to do but require a lot of tedious steps to complete it.
path lines is a different beast than the copying, path lines had an interesting premise to wrap your head around whereas the copying is a lot of the time just about pushing blocks which if done wrong can lead to tedium fast.
if you are making bigger levels make them all feel interesting and have unique experiences.