When you buy the game through humble you will be sent an email with download links, itch.io is just for the demo.
Did you use a valid email address when you purchased? If not email me and I'll help you.
NVM i just got it befor you replied.
lol its the same size as the demo that's realy odd.
another thing whats whit the crystal orb at the first map
in the demo it whas disabled
its even disabled on full version