still no idea
I still have no idea. That is, already when Chain Reaction won in round 1of the voting I thought I’d just remake an old puzzle game where you place to bombs to set up a chain reaction of explosions. Problem is, I already remade that very game in SpeedHack once, so it would be like totally un-inventive, a re-remake.
Another idea I’m toying with is, a chain reaction of light bulbs. Like, you have to light a Christmas tree with electrical bulbs, and a chain reaction is involved. A level is won when you manage to light the tree. Still don’t have a complete plan how it should work though.