We-e-l-l-l, before packing one off to another planet, I'd want to see a couple of them show a little "evolutionary initiative", and spontaneously escape over the dunes 
When I look at the videos, I only see the Crochet Critters frolicking on surfaces that are pretty smooth, flat, firm, and free of obstacles. Unless their little feetsies are a lot heavier than they look, Jansen's animals have a relatively high CG, that can easily get outside their base of support on a fairly modest slope.
I suspect that an attempt to climb a dune against any but the gentlest of downslope breezes would turn them from "artificial animals" into "artificial tumbleweeds" 
Ran