That would be possible if you had the PSP version. That way you can use a USB to put your levels into the computer and turn the folder that has the levels into a zip file and put it in megauploads. That's just what I think. I have yet to try that with anyone. Also the slot where you saved the levels has to be the same number as the one that is empty, like for example:
Let's say you made the levels on the 10th levelpak. If I were to put the folder in my memory stick, my 10th levelpak needs to be empty, like in the picture. One levelpak can't overwrite a file that is already being used. I tested that by putting my 8th levelpak into another memory stick, that has an empty 8th file. I don't know if that will work with putting someone's levels into mines, like I said I haven't tested that with anyone.
Here's a weird looking "Just Dig". The repeated version where you use the bombers works too, if you add bombers in the skill.