Pocket MuuMuu (1999) was a Japan exclusive PSOne game that contained several downloadable PocketStation titles.
One of these unlockable PocketStation game is called ASTRO FIGHTER where you need to shoot down incoming missiles Whack-A-Mole style. There are boss battles and some nice cutscenes too. In short, it is a nice, little mini game. Well done.
Here is a quick 60-second review of this game you never played.
Special thanks goes to Patreon supporter ANAPAN for supplying me with this PocketStation and the USB PS3 Mem Card adapter. This video would not have been possible without his support.
