I personally didn't like it. But it was addicting!
When I first bought it, I got it from a local Gamestop, and I just plain HATED it!
I thought the graphics sucked (but, yet again, I still do; I mean Pokemon had better graphics- and it was on the same system!), the difficulty (for me) was insanely hard, and the levels were too wierd! I couldn't tell what anything was because the graphics sucked, and because of the bad level design, it was very hard. But one good thing about this game was that it was so hard that it was addicting... if that makes any sense whatsoever...
But wait! one OTHER good thing about this game is the fantastic music in the levels! I remember the overworld music whenever I think of this game (because it and Wario Land 2 haunt me because I sold them and want them again but never got around to buying them) since the music is so dang catchy!
So all in all, it's a highly addictive game even though it is difficult and has poor graphics (for the GameBoy) and I would play it again because it's a classic and practically every gamer stuck in the past would kill to have this game.
(I am not saying that I am a gamer stuck in the past. I am saying that I would play it again.)