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A sort of "horizontal space shooter homage" that, despite its obscurity, isn't short of unused content.
This enemy rocks from side to side. It is unknown what its purpose was, although judging by its design, it was probably designed to fire large projectiles.
This enemy rocks from side to side as well, as its back moves back and forth. It is unknown what its purpose was, although judging by its design, it was probably designed to fire multiple smaller projectiles.
A pair of bat-like enemies (one facing left and one facing right) that rotate. It is unknown what their purpose was, although judging by its design, it was probably designed to fly across the screen in a pattern. It is likely that these were the initial designs for a bat-like enemy in the final version, as it has the same rotation. Despite this, the bat enemy did not have a left-facing version, only a right-facing version.
A very strange enemy. It's very hard to determine what it is. It rotates. It is unknown what its purpose was, although judging by its design, it was probably designed to float around in the playing field.
Sideways Flamethrower Rocks
Unused frames of what appear to be a left flamethrower used on asteroids? in the asteroid levels. The in-game rocks only use flamethrowers on their tops and bottoms. They may be part of an early design for the asteroid rocks, as their shapes do not match the final rocks. The covering rock seems to have been rendered behind the gun on the second to last frame on accident.
Unused Minelayer Animation Frames
Minelayers only appear moving (diagonally) left using columns 4 through 6, but there are graphics accommodating 8 directions total.
A strange weapon that looks like it may have been an initial design for the mines. The weapon only survives through these interface images.
A series of red letters on black backgrounds that were found among the game's image files. They were probably placeholder UI graphics for the special weapons.
Strangely, the "SB" is written in a different font to the others.