Beautiful presentation. Looks just like a classic Gameboy game (Link's Awakening, Pokemon Blue/Red, Jurassic Park). The game gives an effective impression of large scope, with the switching between space travel and planetary exploration.
Some areas do not have music, and the absence is felt. (This happened to me, too... I ran out of time for composing.)
Also, it would be helpful if the player character could have a wounded animation (or get knocked back, or flash, etc.). I would notice that I had been hit only when I checked the HUD in the upper left corner.
Lastly, I felt myself wanting to know more about the characters and their world. The villagers mostly said generic lines ("Welcome to our village," etc.). This is an opportunity to show what is unique and distinctive about each of these worlds in particular.