I managed to score one point! Its the movement of the player that is dragging. I guess you are using a dynamic rigidbody. Maybe a kinematic would be better.
The addition of tilting and fire was nice but if I were you I wouldn't give more time polishing this game unless you want to show it to a friend or a future potential employer maybe.
Thanks for checking my game also. I intend to update since I received many good comments and many people followed me.