Oh please it's just a gaping chest wound that should most definitely have shot through his spine leaving him paralyzed at least from the waist down. Put a band-aid on it he'll be fine.
I like how this evil god seemed very lovecraftian then summons spawn that see very reminiscent of the Star Children. That’s a win in my book even with the standard trope of the MC getting a hole blown in them to return just fine next chapter I’m sure.
I mean, he did just talk about being able to rewrite this worlds logic. So if by the world logic he is dead, he can rewrite himself as alive. It only makes sense.