yes. major updates (0.X) are to be paid for separately
Wow ok, that's a bit ridiculous to pay 9$ for an update every time on a game that doesn't have all that much content yet. There are plenty of other games that cost a lot less for way more content and you only have to pay once.
atm, we can not do it any other way. you can wait for the 0.9 and pay once for the lifetime access