Can't give it 5/5 because it's a bit easy and very short but it had me hooked while I was playing it. If this is the shape of Unity3 games to come then bring it on.
I like it. Only things that stopped 5/5 were that that the challenges should be to minimise pieces, rather than maximise (or, at least ensure that all of the pieces have to be in a beam) and that it should be possible to view the rewards immediately, rather than having to go back to the trophy room. Opening up to user levels would be nice, too.
Fun but too easy, particularly after the first game. I got five days on my second attempt. Needs more targets. I want to see the hedgehog becoming part of Saturn's rings. 3/5