Aquaventure

Made in a period dominated by space-themed games, Aquaventure’s colorful and challenging undersea gameplay was a breath of fresh air. The game was never released on cartridge, until now.

The goal of Aquaventure is to dive to an undersea cavern and retrieve a treasure before running out of oxygen. As you make your way downward you must either avoid menacing sea creatures that harass and delay you, or kill them with your speargun. Killing them spawns replacements that are faster and stronger, so you need to pick your moments.

The joy of victory is fleeting. Once you reach the treasure you encounter a mermaid who advances you to increasingly difficult levels, where you dive for treasure against faster enemies and with less air.

Source: TheGamesDB