It starts off ear piercing, way too loud! The picked bass 43 seconds in sounds very neat. The synth in the background is barely noticeable, not only should it have been louder, but also more prominent. I like the xylophone melody, it has a unique style to it.
I would consider 1:47 to be the "main theme" of the entire thing, I mean that it's the part that stands out the most. When the voices at 2:18 come in it sounds very Majora's Mask-like. Reminds me of the segment in the game where aliens invade Romani Ranch.
At 2:50 it sounds like it's repeating for the most part, with a few minor changes. To me that's not a weakness, but so is the way it ends, would have preferred if the last 15 seconds or so were faded out or something. And again, the audio at 3:07, 3:38 and 4:11 are loud to the point that they distract the ears from the rest.
The mixing could use some improvements. Most instruments sound too centered. For example at 1:55, another xylophone with slightly lower volume could have been added and panned to the right. Or how about the synth from the beginning? It would have sounded much better if it had a longer reach to the sides.
Conclusion:
- Cool bassline
- The volume & panning is unbalanced between the instruments
- Has a memorable melody
- Good variation