Gunpey Ex, for the WonderSwan, seems to be an enhanced version or a sequel to the original Gunpey title. The [!] notation suggests unique features or gameplay changes.  The Japanese release ([J]) is again noted.  However, the absence of readily available information requires deeper research into Japanese game databases to determine the specific improvements, the developer, and the game's overall reception.

GunPey Ex (J) [!]

Guilty Gear Petit 2 (J) [!]