I'm not sure if the title is being helpful to drag people into this thread
I was having a good time with the first level, but after the second half of the second one I realised the levels have been blatantly edited from the original... They're all easily recognisable since they use the same set of foreground/background and enemies/sprites. It's a good idea to try to make your own levels from scratch instead.
What do those mini-Luigis indicate, exactly? They're always around bonuses and such but they don't seem to serve a very specific purpose. I think they could be less out of place if they meant something.
In any case, good luck; this seems like it can become something nice.