but did you slaughter them like animals
It's funny.
My intention was to study which levels I could get away with murdering all the crowd on and then live-stream them. Tatooine doesn't lock you out until you meet Anakin who calls you a murderer (but I wasn't able to get to that point when I was testing due to the Invincible Rocket-Launching Jawas).
The Oota-Gunga level (where I was killing Gungans) doesn't seem to have a fail state upto the furthermost point I reached (I gave up on the world's stufftiest platforming challenge), but it screws you over loving early if you are going for a 100% kill run; your teammates have LOW loving health, and Qui-Gon stands in front of a Gungan who is scripted to throw a grenade at you every single time you enter the room after you've initiated a killing spree, which bounces off and blows Qui-Gon to bits, inducing a failure state. Only way to get around that is to rush into that room, kill the door-guard and then skip through to the next chunk of the level where Qui-Gon and Jar-Jar don't follow you.
I find it kind of ironic that Qui-Gon is always the one who dies, whereas Jar-Jar is practically invincible unless you really try to kill the bastard.