Great job, the puzzles are well thought out and force you to think non-linearly. Bravo! A co-op would sit very well here. The fantasy of robots could translate as if one robot charges in the sun and the other overheats and therefore one likes light the other dark - there is many ways to develop this idea. Or in a completely different way, maybe a fungus and a plant, one likes dark the other light... Sorry that I think out loud, but Jam soooo strongly stimulates to invent and brainstorm! :D