Wow, what an awesome game! I really enjoyed the experience and your 3D modelling skills are VERY good. Only thing was I found that the sensitivity was a bit high for me, maybe a settings menu could fix this? Also, probably just my computers fault, but I found that it took ages to laod between scenes. Final thing, you should probably add an exit button to the main menu.
Other than that this project is looking awesome and I cant wait to see where it goes in the future.