Think Bahamut Zero. Yes, looks like the planet heals pretty fast
Just to clarify some things that seemed kinda muddled last time...
Planets don't heal themselves since an organism needs cells to heal. The lifestream is the only thing that could possibly "heal" the planet. I just wanted to point this out because I'd seen arguments to the extent of "if it's been healing all this time the crater must have been much bigger at first", but planets don't heal. They just change. If planets healed there would be no such thing as mountains or valleys.
As to the size of the crater, have you ever watched Dragon Ball Z? Ever notice how the impact left by someone hitting the ground is much bigger than the person? I'm not saying the two exist in the same reality with the same laws of physics, I'm saying anime likes to break laws of physics to show how ultra-powerful people are.
