Yikes, so sorry you've had that issue! Can't say we've had that particular bug reported to us yet, can you confirm please whether the sensitivity is too high for you on both the WebGL and the PC version, if possible? We shall definitely sort that for the post-voting patch!
That is odd! For myself and the rest of the team the sensitivity felt "normal" so we didn't think to account for sensitivity preferences, clearly that was an oversight on our part. I have experienced other games in the jam with high base sensitivity so maybe it's something odd about how Unity interacts with some mouse hardware? Something to definitely account for in future.
For this project, we have a sensitivity slider ready to go for the next update!