Illvelo: Illmatic Envelope (2008)

Illvelo, also named Illmatic Envelope, is a vertical shmup initially released for the NAOMI arcade system by MileStone Inc. in 2008. It's mostly noticeable for its trippy level backgrounds, bizarre sound effects and wacky enemy visual designs.

• Release Date: June 11, 2008
• Developer: MileStone Inc.