What would happen if instead of an alien invasion, we humans were the invaders of an alien planet?

There might be a chance that extraterrestrials do exist out there. However, unlike the technologically advanced stereotypes, what if they were primitive? What if the reason why we never saw aliens is because they are too primitive to have technology like spaceships. What if they are a hunter-gatherer society?

Imagine if we, the humans, come across their planet, see the natives' hunting and gathering traditions, and decide to take their land for ourselves. What if the aliens' spears, knives and arrows were no match for the humans' guns, bombs and nuclear weapons?

It would be just like colonialism again, only not just white people, but the entire human species will be involved. Instead of aliens invading Earth, it's the other way around; humans invading an alien planet.
What would happen if instead of an alien invasion, we humans were the invaders of an alien planet?
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