WOW. Just wow. If you own a Wii and have not played Cave Story, save up a few bucks and buy it. Take the engine from Super Metroid and add some seriously improved gameplay mechanics, and you have Cave Story. Cave Story is one of the funnest games Wiiware has to offer, and here's why.
First off, Cave Story is fun to play. The controls are responsive and simple, which also means you can play this with whatever controller you want. Cave Story is compatible with the Gamecube Controller, Wiimote, and Classic Controller, which allows for a wide variety of options. I personally prefer the Wiimote which works great and feels very traditional. I appreciate that Nicalis didn't add unnecessary waggle to an awesome game.
My absolute favorite thing about this game has two parts. It has an intense story that's actually deep. This adds a nice contrast to it's cartoony nature in the same way Earthbound did. And that's a good comparison. Earthbound. But instead of an RPG, you're a sidescrolling hero with a ton of explosives. The best part about the deep, and often dark story, is that Cave Story never takes itself too seriously. It makes fun of itself from time to time, but not too much, just enough to keep the player from getting depressed at a serious part. And you're bound to get depressed while playing this game.
Cave Story is like Metroid, but with humor, better platforming, a clever style, and a pretty good price at 1200 Wii points, or $12 USD. This means you'll have to get 2000 wii points, which means you'll have 800 left over to buy FF6. Excellent! If only I could play Cave Story and FF6 with an NES Advantage...
In conclusion, all I really have to say is this: