Hello!
Thanks for the clear and honest feedback!
The world ended up not having nearly as much enemies and POIs as we would have wanted and that might contribute to the feeling of emptiness you have experienced.
The striking sigil will be tuned for the postjam hotfix!
We will update the game with more features and content. It is good to hear that you would like to see more of it!
There is a way to adjust the mouse sensitivity by using the Page up & down keys, but this was not written down anywhere before you played. We will make a dedicated settings page.
Thanks for playing!