Stardust

Stardust is an Asteroids clone but it introduces a lot of gameplay modifications. There are 30 standard levels splitted into 5 worlds. Levels can be completed in any order however, you must fight an end-of-level guardian once you have finished the sixth level of a world. In each level there are standard disintegrating rocks to destroy. Their colour defines their endurance: greys are the easiest to be destroyed while yellows are the hardest. In most of the levels there are also other enemies but there are happens to be also some alliance forces providing us with new types of weapons or missiles.