When I was trying Lemini, I tried some levels I found somewhere. There was this level where you had to use the digger or diggers on the same spot and because it was lemini I was using the digger and it never allowed me to do it at all but when I tried in the dos No bother so I guess each has it's own advantage.
The dos custlems seem to be my favourite just now with Lemini close behind.
The one really good thing about Lemini is the action replay where if you make a mistake don't worry you can go right back to that particular bit.
I might try your levels as well thick molasses.
I have to admit, a lot of the levels I've seen on that website are well designed and I'm impressed with the thought that's went into lots of the levels.