Maybe I`m wrong but IMHO the problem is (at least for me) that new levels are great but overall not complete. That means not coherently level like in original game. If I remember right there are 4 levels in one world (how many worlds I don`t know). So the target should be to have at least one complete world (a lot of work
). Unfortunately the lack of feedback can stop work if you aren`t 100% self interested (do it for yourself) and you are alone.