This is a rather simple source, where it's all about dark atmosphere, so nothing too complicated in the theme. As a result i tried a combination of ambient with maybe a bit of funk, as i would imagine this is how it would be in the original. Again it's a Game Boy Advance game, so we will expect saw-tooth synthesis and cheap squarewaves. Great tune though.
Let's just say it's a sound upgrade, for the sake of easiness lol. I hope you enjoy anyways.