Metroid: Confrontation is a small complete game, set in the Metroid universe. It started as a small tech demo, used to show the engine capabilities. It slowly evolved into what it is today: a small but action packed Metroid adventure, with 3 epic boss fights and many secrets.
MediaFire - Crocko - FileHosting - FileSave - Mirror1 (Thanks Matt!)
If you need help finding all the secrets, or you're planning an awesome speedrun, you can find many interesting topics in the Forum, there's a dedicated section for Metroid: Confrontation.