Shutter & Shutter

About
Shutter & Shutter is a game made by KCS and published by Champion Soft.

Gameplay
It's a one-screen platformer where your goal is to kill? Collect? birds and not get killed by the aliens. It's a score attack game, so there's no end.

The game's titular shutters make this significantly harder however, as they can shut and close off a path.

You use the numpad (2468) for movement and the spacebar to jump.