Its so cool that you participated as a family! The 3D was really beautiful (the wooden box and mist effects especially), music was nice, and the controls were good (and with no glitches when walking through rough terrain). But similar to other comments, I also though the sensitivity was a little too high, and maybe the jump was a little too low / quick (most 3D games longer "air" time, so it felt off at first, but you can always say the gravity is stronger on the planet).
I didn't find the last food, but I managed to pass the red-white limit and fall out of the world! \o/ (I like finding bugs.) It's possible to jump over them directly by jumping exactly over where they bend, or by walking/jumping through the rocks on the sides. You will probably change this completely the new version, but I think a huge invisible wall would have done the job as well.
I'm still wondering why some rocks are black. Was it a lighting bug/feature, or is there a mystery to solve?
Anyway, great job!