I'm a huge fan of this game. I love the gravitational pull idea, I like that when the planet gets smaller you have an easier time stopping detritus from the other side, it gets gradually more chaotic as you go, all so good! I can see this as a mobile experience also. other nice thing is a clear path to upgrades if you wanted it, anything from standard space shooter weapon upgrades to ability to regrow the planet all the way to skills trees of some kind, more cannons, zooming out, having to defend an entire other planet at teh same time kind of pinball style... a really solid core game.