In "Qix" (1981) the goal is to claim most of the play area by cutting new sections at right angles, either quickly (blue) or slowly (red, more points).

You move along the innermost edges and only exit to cut. If you're hit by the randomly moving lines while cutting, you die. If you stay on the edges for too long, the sparks catch you and you die. You have to keep moving and cutting.

It's hard but fun. I like the abstract visuals and the very electronic sound effects. 💯