Thank you! I agree with all those points, the barrel rolls were something which were implemented in the game, but never got finished, I decided to keep them in as a nice little touch and ensure there were no enemies on the track.
As I was the only programmer for the game, a lot of the gameplay was limited, so stuff like guns with reload and the rolling not *doing* anything were all down to me not having enough time to implement anything to use it with, although given more time, I most definitely would've implemented more gameplay.
And by filter, I assume you mean the blue fog in the game? Or perhaps the resolution the game was set at? I haven't really got that much of an eye for art, so that may be why that was lacking.