The demo is always 1 update behind the paid one. To put it another way, when 0.34 comes out, 0.33 is free for everyone. When 0.35 comes out, 0.34 becomes free for everyone.
Probably would have been more lucrative to make the demo limited, but I was originally hoping to make the game free and I still want as many people as possible to enjoy it. It's just that pure donations wasn't cutting it for income.