Hello, maybe someone know, I was playing a demo game form pc, maybe between 1996-2000, was about a spaceship, was like 3d game, was a scroll down very slowly , you were shooting everything in bases and air(space)for every amount of enemies you kill you will level up on power, up to level 7, you weapon was a long laser type line getting brighter and thicker by level up, if you get hit you get down a level, the enemy boss was a mothership at the end of that round, after you destroy it , all start over because was just the demo, but you kept the levels you are on. I hope somebody can help, thanks.