Basically the embodiment of the Gameboy soul. Both graphics and sound design complements each other. Gameplay is simple but have enough variety to keep me interested. Level design is also well done since I'm able to smoothly progress through the objective. It's cool how you have the stars create paths between planets. The warp feature also comes in handy by cutting away the boring backtracking. Checkpoints are very lenient and kept me trying.
One thing that can be improved would be to reduce the time spent in dialogue by not 'hiding' it every single time. Leaving the villages without a music track makes them feel a bit more deserted than they actually are, but I see that you're planning to work on that post-jam. Not sure about the others, but the difficulty of the last planet is a little high for me. It took me a few tries to clear.
Great job creating such a complete experience in just the duration of the jam!