Cool and fun game! Nice gameplay loop and it's interesting how the optimal gameplay loop changes for the player as you start to make the planet greener. I was able to make the whole planet green after killing a lot of aliens, but they started spawning in a single spot outside of the stage, so I just sat there and spawn killed them. Idk if this was intentional or if the game should've ended there(?). Either way, super fun experience and good job :D