Thank you for the feedback. The frame rate is as high as it can get. It is made in Python, which is quite slow. As for the sensitivity, you can change it in the settings. The game is a bit unforgiving at points. I might tweak that.
Python is not suited for these kinds of projects. The issue with the game is not optimizing. It is the language it is written in. Python is very slow, so the performance of this game is as good as it can get.