A game, which had it’s own ideas about the level design for games, which created it’s own subgenre.
But by itself it is extremely outdated, repetitive and small of content. If i had it in my 8-bit era, i wouldn’t like it very much either, just like we never considered Super Mario Bros. worth the effort. Though i don’t think i consider it a κρυπτόκόπρος like The Legend of Zelda, as far as i can remember the game can be finished without any of the random obtuse secret passes leading to some advanced items.
I used Nestopia 1.40