This is really good! Would have felt right at home on a gameboy.
The graphics are nice and clear, the gameplay is smooth and fluid, and the overall feel is quite nice. The sounds are clear and crisp and what story there is told through world elements, which I appreciated.
The one thing I continuously felt I was missing was a map, as I was backtracking a lot and I felt a map would really help me navigate back to the areas I'd previously not been able to progress through (due to lacking double jump, etc).
I haven't played your first version of this game for the prior gamejam, so I can't speak to it's progress.
This is solid! Well done!