Nice idea! The visuals and sound effects are quite good, and congrats on making nice procedurally generated Earths for us to nuke all we want :P
It is pretty tough though, I've played for a bit but never managed to get all factories before the timer ran out. I think at most I got a game with maybe 3 of them left scattered all around the globe. It would be nice to have a score actually telling you how many you nuked and/or how many were left to save Earth. The game is so fast paced that I didn't notice the rising sea levels before reading about them on the itch page :D