I've now completed every level in The Lake and Temple Ruins, and all but 3 in Solitary Island (the ones numbered 3, 4 and 6 in dice markings rather than numerals). Of those - I've spent a lot of time on Tiny Isle but haven't found a solution, while I've only spent a limited amount of time on the other two (Dim Signal and Evaporating River) so far. I'm really loving some of the solutions I'm seeing in Temple Ruins!