It's a VERY old game (possibly 20 years or more), it's a monocromatic vertical scroller with a small shooter ship, that goes up one screen at a time, when you reach the top of the screen, or kill all the enemies on the current screen, the level changes. The name is something like "level [number]", or "stage [number]", if memory isn't failing me
@YiJiang'sEvilClone I'm pretty sure that in a lot of them, the player's ship doesn't go all the way to the top of the screen (at least the ones I've seen)
@JasonBerkan Yeah, I know, (completely unrelated to my question) I just found a CD from 1995 full of shareware yesterday and I was going to copy it, but it felt to the floor and cracked =/