Great game. The aesthetics and music give off a relaxed and yet melancholic mood that's both chill and worrisome. Makes me think the dog is lost and only has his trusty stick to keep him company.
The puzzles are fairly well designed with intention and deliberation. Each obstacle has a purpose for being there and it shows remarkable polish. I would expect that puzzle games such as these have been extensively tested.
For a demo, it shows great promise. I'll be looking forward to when this releases :-)