Unplayable is the word. This mouse business is a longstanding bug. It works fine in the editor and I have less than no idea what causes it. The rest I'll take care of.
Looks like the camera now is broken. It badly follows the player.
I don't know is this a bugs:
-Music player is playing music not so random. Some tracks playing too oftenly(meaveena for example).
-The car boss is too easy to beat, can't damage you at all.
-first time you die after starting a new game, after you hit "retry" button, the game starts from the beginning, not from the last time you saved. In order to make game save working, you need to go to the main menu, then load the campaign.