A great step up from the original game. I played a full 25 hours of this game, and 100%ed it completely.
Captain Syrup returns and you defeat her, whether it's in a factory, or a mansion, or at the bottom of the sea. I like him much differing routes there are, and doing all of them and getting every treasure and completing the treasure map unlocks the final stage.
The gameplay is similar to the original, but this time Wario is invinccibleee!!! and has different "power-ups" depending on what the enemies do to them. It's fairly fun, and there's tons of secret leading to coins, treasures, and even secret exits.
The credits theme is now ingrained in my brain.
Overall alright, an enjoyable time.