Beautiful!
I don't normally like "retro" games. I generally feel like they contain an inherent lack of effort, but (whether that's true or not) this game was excellent. Simple, fun, nice power ups, and puzzles which weren't particularly difficult, but were fun to solve (much like the dungeons in the Zelda games). It also had a really nice length to it, and I do not regret playing it all the way through.
And the story line! Superb!