Not interactive, and maybe not too innovative, but after playing through it again(and again, and again)the end credits of Warship Gunner 2 goes through one of two setups, one for the first playthrough and one for subsequent ones.
What doesn't change: the music, the names, the order, the length.
What does change: the background and possibly the color scheme.
What's so special? Well, in the background(I believe a blue hue for the first run, and a more goldish one for subsequent runs) you see pictures of bosses you faced and beat, as well as some you didn't because of the branching story. The big deal, though, is the main background consisting of a ship. Either the camera rotates around the ship(first), or the camera is at a set point aimed a the ship coming towards it.
"That's fine, but not that special." And that would be true aside from the parting piece. See, the game goes to credits as soon as the final mission is completed. You might expect a generic ship of whatever class in the background, and if you build a sensible ship you may not catch it at first, but whatever ship you just kicked ass in, is the ship in the background down to the flag flying high above. If you had a ship made of missile launchers, you'll see it in all it's glory.
First time I noticed, I was already jacked from beating the boss, so I was awestruck that the developers had thought of that.