The Japanese text 忘れじの (Never Forget To) enclosed in the speech balloon on the package is part of the official title.
MSX with a floppy disk drive has to be started with the SHIFT key pushed, otherwise the game fails.
The game is based on Nausicaä of the Valley of the Wind the anime/manga.
Cursor: Moves the gunship/mehve
Space: Fires from the gunship
F1: Launches the mehve
F2: Drops the strobe grenade to calm the ohmu
F3: Connects the barge
F4: Disconnects the barge
F5: Negotiates with Dorok
Walkthroughs: https://lemmy.exblog.jp/5193934/ http://toshidensetsu.s1007.xrea.com/anime/100417.html