Really amazing game for the jam! I played all the way through and loved every bit :D A couple tips: You slide a bit when you stand still on some platforms. You should add a physics material with friction to them :) Also, the art is beautiful and I loved the cell shader you have! Sometimes, though, it was a bit difficult to tell if I would land the jump because of the lighting. Maybe make the edges more obvious in terms of modelling? Anyway, loved the game, incredible job!
I'm really glad that you liked it ! Also, you do raise some good points.
Actually, I didn't use Unity's physics library to handle the character's behaviour, since it is not easily fine-tuned for a fluid platformer gameplay, especially one that diverges from standard gravity. That means I resorted to coding a character controller from scratch, using lower level functions for collision detection, resulting in some problematic edge cases when a platform's dimensions didn't allow it to follow the planet's curvature closely enough. All of this would still require a whole lot of polishing.
I also wholeheartedly agree with your second issue. This one could probably be solved by tweaking the shader I used for most platforms, and more importantly by giving the player more control over camera movement.
I hope you'll be able to play a more polished version in a not-too-distant future.