Sounds good enough for me...

Just a tip. Try to find good backgrounds in the real world (an empty factory, a field of grass with some obstacles etc) and make photos of them which you use in your game as backgrounds in the LG part. Personally I like this "visual effect" of playing lightgun games, which give the impression of taking place in a realistic environment (it has something of playing a movie feeling). And if you make the background a little bigger than the screen resolution, you can make it scrollable to the left and right for some "motion"... I think even a 2D LG game can make enough fun with some "nice visuals"...

I don't know what your graphics will look like (if you use comic style then forget what I said ).

Greetings,
Dirk