Space Popo is a single screen fixed shooter, but this ain’t no Space Invaders or Galaga. In this MSX game by meichnpp, you are faced with rocks and aliens, and you need to get rid of the aliens.
Sadly, your missiles don’t work on the aliens, but they do work on the rocks. And once you’ve shot a rock, you can aim it towards an alien. (It makes more sense when you play it)