This one's really good. I completely disagree with people suggesting a drop down mechanic, having less options can sometimes make a game mechanically more interesting and I think that's what makes this one just the right amount of extra difficult. You have to plan ahead with movement, I love it.
How many levels are there? I got to the second one with birds.
Oh, one nitpicky thing I guess: to someone who doesn't pay attention in the intro (me) it wasn't clear that you're supposed to collect the gold parts to finish a level. Figured that out a little late.