It's perfectly reasonable for colonists to be hunted by the savage native wildlife of a faraway planet. Baseline humans probably aren't the top of the food chain on every world.
That said, I feel like if there's a problem, it's that almost all of the native animals are uniformly presented with an appearance similar to their terrestrial counterparts. It sets an expectation for the player that a xeno-deer will behave in a similar way to a terrestrial deer when threatened, which is not the case.
I would favor making the fictional animals like wargs and megatherisloths more aggressive and prone to hunt colonists, and making other animals like ibex passive and predictable when attacked.
That said, I feel like if there's a problem, it's that almost all of the native animals are uniformly presented with an appearance similar to their terrestrial counterparts. It sets an expectation for the player that a xeno-deer will behave in a similar way to a terrestrial deer when threatened, which is not the case.
I would favor making the fictional animals like wargs and megatherisloths more aggressive and prone to hunt colonists, and making other animals like ibex passive and predictable when attacked.