When moving very slowly the sensitivity is actually correct, but fast movement results in a huge acceleration spike.

This game was previously supported, but it is now broken.

For what is worth, months ago I submitted a bug report on the official discord and the devs were kind enough to let me know they were aware of the issues. Last month an user posted on the now disabled Sker Ritual page right? Almost two hours after you responded to d7mylil, the devs released a small fix targeting the broken sens haha.

So, maybe the mouse input issues were also finally fixed?