Wait - it's mouse sensitivity? I'll be honest, this whole time I've just assumed it had to do with like, the creatures' sensitivity to your presence or something, since it's right next to the aggressivity and density settings. If it's just mouse sensitivity, then I'm sure it's fine to relax that requirement.
On that topic though, I'm still of two minds about the aggressivity and density settings. On the one hand, they're just normal settings that I'm sure you were intended to mess around with, and it does feel arbitrary to restrict them. But on the other hand, they feel a lot like difficulty sliders, and keeping things at the default difficulty just feels right, especially when the obvious move would seem to be to maximize density and minimize aggressivity for a kind of boring run. And while it'd be possible to make separate categories for default and custom settings, I don't think a game this small needs even more category bloat for a pretty minor thing.
(That is assuming "density" refers to the animal spawning density, which I've also just been assuming, but now I'm also second-guessing that - though I'm not sure what else it could refer to.)
