Happy to help!
Regarding worries about sensitivity being too high and letting players "cheat" a bit
- I, and other players, could probably cheese it in the current state if we wanted to anyway - I've got a razer mouse that I can whack up to insane dpi.
- Idk how the physics works, but you could try something like writing a script that checks the players speed every frame and limits it.
Although I'm not that familiar with getting over it style games, I do think your game has potential to be rather good. Do work on it and refine it more.