First Impressions: SpaceChem / Toki Tori

I picked up two new puzzle games in the Steam Summer Camp Sale, mainly because they had achievements which gain competition entries, but also because they were on offer. One is called SpaceChem, a strange logic puzzle involving molecules, elements and bonds. The other is called Toki Tori, a platform/collection type game. I've played both games a little and acquired the competition achievements in each one. The question is now, are either of them good enough for me to continue playing? Probably not right away with everything else I've got going on at the moment, but perhaps one day. SpaceChem in particular is a really interesting concept which I imagine will take a lot of thought to master.