I remember playing this very briefly when it came out and liking the concept, but never really stuck around long enough to get into it. After getting deeper into the mechanics, I have to say this is easily one of your better games. The original graphics and color scheme are attractive, the concept is good and the dynamic environment keeps things interesting.
As far as flaws, the gameplay is slightly repetitive, with the biggest issue being the way the bubble system works to reset enemies that fall too far down - it's too repetitive and can lead to enemies getting stuck in the same ruts. The items are also generally not too useful. I beat this game with two deaths and never needed much aside from seeds and (at most) one health potion per level. A boss at the end would have been nice also. Some items (namely the bomb) are so underpowered and expensive that they seem like a complete waste, and I don't think I ever used the wings at all.