Okay: some very quick impressions after only a couple hours of gameplay:
As has been noted before the star of the game is the quirky design. Every object in the game is quite detailed and the friends and enemies you encounter are oozing style and character. I quite enjoy the concept of all your weapons being constructed from found parts - but wish you got to actually build them yourself in a Nuts & Bolts style rather than just being told what you need and when you have all the bits.
In my very brief play I encountered multiple camera problems. Often I'd jump to a platform near a wall and find the camera claustrophobically rotated behind me so all I can see is a little part of wall and none of the surrounding environment. This means that when exploring I spent a LOT of time between each jump rotating the camera around to find my next destination.
Also with all the great design and detail some of the larger environments felt somewhat cluttered, though this could be an intentional design choice. You frequently have multiple paths to reach an objective, and since the game has no problems that I could detect with draw distance or number of objects on the screen I found myself somewhat overwhelmed with potential choices when looking out at some of the large environments. (I'm thinking in particular here of the third level areas with the rabits - huge and just FULL of things to interact with and different areas to try to jump to, glide to and explore.)
I'll try to post more when I have time to complete the whole game - but with the holiday upon me now I don't know how much gaming I'll be able to get in. (Animal Crossing taking up so much of my life and all.)