To be clear, you cannot die while playing as Godzilla--you'll always turn back into a normal player at the end of it, no matter what. From there, you'll play the rest of the match out as usual. You don't, by the way, get any rewards for having been Godzilla in a match, aside from the happy memories.

Transforming into Godzilla gives you access to powerful abilities that can level cities and annihilate other players — as long as you’re the first to enter a special portal. Becoming Godzilla is easier said than done as you must find the portal that spawns randomly,