Wow, polished as heck! I had quite a few emergent gameplay moments with floating on stuff, that feels awesome. If it's possible, I'd love to see more of an emphasis on escaping someplace by riding on a bone, like can so often happen here! XD
I agree that controls could have been streamlined more, which may be a matter of expressing them differently or combining/removing a few options and combining them with movement somehow. Sometimes, it's a matter of giving the player a specific perspective on how they view the controls, so that, for example, they aren't constantly tempted to jump.
With that said, though, I really enjoyed the punchy little mining sounds, the robot's quips, and the overall mechanical feel. If you've got juice in the tank, run with this thing. Nice!