This game is going to be a delight when finished :D. For the most part I really enjoyed what I saw in the demo. The art style is wonderful, the music is wonderful, the animations. This game looks like it's going to be a spiritual successor to the classic Paper Mario (not the new ones, they aren't that great). The only criticism I have is that the controls are a bit clunky when it comes to the abilities. I would maybe suggest have a hot swap button? Maybe one fore melee weapon(Sword and Hammer) and one for special ability (Plane and Tornado). I found myself pressing the wrong buttons quite a bit. Other than that and what's been mentioned by others (Re-spawn checkpoints, and just a lot of falling off) I really liked it. I really look forward to the next demo. Keep up the great work :D.
PS The video title is a joke XD