I don’t really care what gender the MC is, but you could add a choice for the reader if you really want to. I like sad endings. They’re not terrible. As long as the MC doesn’t die, I don’t think many people would be against it. Again, if you really don’t was backlash, then add a points system for a good or sad endings.
You can always get a proof or beta reader. Come talk to me if you need one!