The First 15 Minutes of Viewpoint (PlayStation)

Copied from MobyGames:

Viewpoint is a top-down orthographic perspective game in the tradition of Zaxxon. The PlayStation and Saturn versions feature 3D rendered graphics with texture maps, unlike the other versions which primarily feature shaded polygons.

One or two players (in hot-seat or cooperative mode) control a spaceship equipped with a laser cannon which can be charged (by holding the shooting button down) for a stronger blast. Besides the main weapon, three special weapons are available: a wall of fire which wipes the screen up in a wave, a nova-like blast and a circle of spherical-green homing missiles.