It reminded me of a game I used to play.
In fact it was exactly like it, you had the ability to stay in a robot humanoid form but it also let you switch to a craft, and allowed you to switch back. The game was also done in the same manner of side scrolling and shooting enemies and allowing weapon upgrades. So the game is great, and it was one of my favorite games on sega genesis, but because it existed before, that makes this game unoriginal.
However, it is a good game nonetheless, but to seperate this game from old school games, you'll need to give a plot in the beginning to add some interest. Also, give it some more pizzazz then market it to some gaming company. You still get the 5, its just if you want to reach the top 50, which might be plausible in the future. You have to get other people to vote five en masse.