Can someone tell me what this oldschool spaceship game is called?

Well, this game is A LOT like Galaga, except you could get different guns. For instance, if you collected a yellow thing (can't remember if it was a circle or square or whatever. I think it was a circle) you would get the yellow ammo. Then, if you got another yellow circle thing, it was the next level up of the yellow ammo. But say you got a blue circle thing, then you would start over on the first level of blue ammo. You fought a bunch of other spaceships like in Galaga, and then at the end you fought a big mother ship. It looked almost exactly like Galaga, but I distinctly remember the ammo thing, and I just played an online version of Galaga and it did not have that, unless there is like a sequel or something to it. Please help? You could play co-op too, if that helps. I remember playing on my friend's xbox. Either that or the computer. But I think he had some game where it had a bunch of old school games like that for xbox (the first xbox, btdubs).