The most interesting tidbit about the Flood for me is that the idea of it being global is a recent belief. Long ago it was not thought as such. The only reason to think it was global is the Hebrew 'eretz' translated as 'earth', which is a poor word to choose because it means a lot more to modern ears than to the ears of those it was written for. When we think of earth, we think of planet, but those it was written for would not have thought that.
Also, if you look through Genesis, the only place 'eretz' is translated as 'earth' is in the Noah story. Everywhere else it is translated as 'soil', 'ground' or 'land'. If you replace 'eretz' and therefore 'earth' in the Noah story with 'ground' or 'land', suddenly it doesn't say the flood was global, and neither does it in the original Hebrew because it never did, and it wasn't.
No, I don't believe all humans were killed by the flood. There are no reasons to think it was. There are at least 5 other copies of Noah's flood story: Gilgamesh, Atrahasis, Ziusudra, Berossus, and Moses of Khoren, some of which are older than Genesis and were direct or indirect sources for Genesis, and none of them are global floods. I'd suggest reading the other sources. They are obviously the same story but the differences are interesting.
Regardless, eretz definitely doesn't mean planet.
If you are interested, I'd recommend Robert M. Best's book Noah's Ark and the Ziusudra Epic.
I realize that my views could be viewed as fideist and anti-intellectual. On the other hand, it would be a shame if great learning were to keep someone from accepting the simple truth of the Gospel. Or am I extrapolating too far to think that someone who rejects a world-wide Noahic flood also rejects the literal bodily resurrection of Jesus Christ?
Additionally, the ages and years in Genesis are wrong. They were mistranslated from Sumerian. If you translate them back and re-translate them properly, people in the Bible all lived normal ages. For example, instead of living 930 years, Adam lived 81 years.
Methuselah appears to have died in the flood but there are additional manipulations of the ages. This is apparent if you compare the ages in the Masoretic, Samaritan and Septuagint texts. Methuselah's age was reduced by some scribe when they noticed his age would have meant he survived the flood, and they couldn't have that.