Cosmic Epsilon is very derivative of Space Harrier. It's also the final Famicom game to support the Famicom 3D System.
The game was advertised in the ending sequence of Top Players' Tennis, but ended up only being released in Japan. A pity, as it's one of the more impressive shooters on the system.
Sub-Page#
Level Select#
Press A, B, Right, Left, Right, Left, Down, Down, Up, Up at the title screen. 
Hidden Messages#
The game has multiple hidden messages from the developers.
For the first one, activate the invincibility code (press Up, A, Right, B, Down, A, Left, B, Up, Select at the title screen), but before the title screen goes away press Select, Up, B, Left, A, Down, B, Right, A, Up for a developer credit. 
At the title screen, enter the Konami code (Up, Up, Down, Down, Left, Right, Left, Right, B, A). 
After beating the game, hold Select before the credits start for these pictures representing the staff. 
Unused Text#
Present at 0x13CB7 is a message similar to the Konami one above. This one references Namco, but there is no known button code to display it.
Game Genie code UOAXNA re-enables the message by entering the Konami code.
I AM NOT NANCO