I discovered this amazingly well-done freeware indy game: Dyson. The player controls seedlings, which are spawned from Dyson trees. Dyson trees, as well as bomb-wielding defensive trees, grow on asteroids. The goal is to spread to other asteroids and defeat AI-controlled enemies. (No multiplayer.) It’s a very asthetically pleasing game. The interface is refreshingly simplistic. The dev team says updates are on the way, which is nice because currently there are some nagging deficiencies. It’s not possible to get anything but a very abstract idea of how long until additional seedlings grow ripe and fall off the tree. This can make it a waiting game. It’s also possible to take over an asteroid without destroying all the trees on it, which can very quickly eliminate a huge investment. Hopefully, as has been suggested in their forums, the game will soon require that all trees be destroyed before an asteroid can be captured.