Very good! The music and overall vibe is very nice and relaxing. And it seems that you have a functioning online leaderboard, which is very impressive!
One small complaint is that the camera feels a bit jerky when you jump. This is pretty common for platformers, and one possible way to fix this is by having a zone in the center of the screen where the camera doesn't move unless you go outside that zone.
Anyway, great stuff! Though I am a liittle bit dissapointed that someone else made a game about a robot scaling a mountain (: