Oh, the memories...
It's probably the nostalgia, as I remember playing Lode Runner as a kid (and failing miserably), but I found this game rather fun. Only thing I'd have to complain about was that the game was a bit too forgiving; that is, if you dig yourself in a hole, you don't die when in shuts up as you did in the ye olde Lode Runner. I don't think it's possible to even kill enemies that way.
Overall it's a fun game.