Gazelle was one of the companies formed by former Toaplan staff after their collapse (the others being Cave and Takumi). The artist and game designer Junya Inoue (aka Joker JUN) worked at Gazelle until it also went under in 1996, after which he joined Cave. Gazelle did not self-publish, doing so through Banpresto. Both of their games were only released in arcade format.
Their Air Gallet is well regarded for being a solid traditional STG with detailed, realistic graphics by JUN.