i think this could be a very cool multiplayer game. The fact that i can shoot at enemies and break their ship and collect the junk and build and upgrade my ship. You will need to design lots of different ships and different upgrades but you make it into a polished and full game, this can be something very popular and fun to play with friends or random people online. Maybe 3d would be better, but you are the dev, and i am sure you will figure it out. Lemme know when you do it. Would love to play it.