eh... you know...
Well, its obviously unoriginal. But the real problem is that you didn't put in much effort to make it unique. A space theme over a retarded helicopter in a cave, a little better, but the gameplay is EXACTLY the game. Perhaps you could make the cave go up and down at times, not always right. Add some time of collectable; fuel, people, money. And more enemies, like things clinging onto the walls. At least this is a good start, but you'd still have to improve it, which most people don't do.