You should check your game settings, it looks like the resolution the game is being played at isn't big enough, resulting in the character being off screen a lot more than I think was the plan.
The jumping also doesn't feel as nice as it could be, it feels rather floaty. Jonas has a tutorial on how to make that better, with the code hosted on github ready to take and adapt for your game :)
Oh, feel free to reply if you manage to fix the resolution thing, then I will try to play again :)