Although the story is very vague, the game involves the attempt to escape from, and ultimately destroy, a giant space station called St. Schutz, a suggestively corrupted utopia; the player controls the titular Sanvein on such an attempt by battling with the station's defense mechanisms.

The Gluon body fires attack patterns in spread-shots while Gluon parts launch a barrage of missiles, the Photon body fires concentrated shots and its parts unleashed a short-range laser blade.

Finally, the Graviton body fires explosive bullets and its parts drop land mines.

However, in each stage, the player's attack power is also boosted by each adjacent cleared floor.

When time runs out, the player has the option to continue, starting at the beginning of the stage again, but their score will be reset.