I'm trying to find an old spaceship game?

In which you control a space ship and shoot aliens to p levels, those aliens drop upgrades like multi shot or shield or different types of weaponry plus different colored coins(silver, gold, green, blue etc.) with those coins you buy upgrades at the end of levels. Explosion and firing effects were quite nice for a 2d game. Bosses and minibosses came in like every 25 levels. These are the details I remember. I'd be really grateful if someone could give me the name :)