Wow, this game didn't age well at all.
The game:
You basically walk around collecting objects looking pieces of your ship. Each island has another elevator somewhere that takes you to another island. You can use the objects you collect, but they're all dumb. Some will make you run faster, some will make you fly. There is no real combat or anything. Some items will be like a gun to kill guys, but they last like 5 shots and you're done.
Basically, you walk around avoiding all the enemies collecting crap you'll hardly ever use.
I recommend this to no one, save your money. There are plenty of titles on the Virtual Console now and especially with Wii Ware out. Don't blow your money on this, even if you played it as a kid.