I'd love to play this but the price system is just total BS, sorry. The final release is the only one that should cost money, IMO, or at least the lifetime licence should be 2-8 bucks, not 50.
As much as I would like to agree to that, I can't because after playing 2 characters in the trial version the game seems very polished and finished as others have said. Like all games, there are rough points, but nothing that patches and hotfixes can't iron out.
Let's put this into a different perspective. You pay 5 dollars for the major version. The major version lasts a year or two before it gets outdated. Are you really going to play this game for 10-20 years? Even some of my most favorite games I don't play for that long on and off before I sell it or lose it or never want to play it again because something better surpasses it in every way. In 10-20 years time, the guy might not be around anymore, he might stop development, or he might move on to something else. He cannot develop it forever.
What I am trying to say is that for the time the game lasts, you could buy the major version for 5 dollars and probably get a lot of time out of that compared to AAA titles. The pricing isn't really that BS, because the lifetime one is only to support the developer. It is his game, he can price it how he likes. A community exists, so others must believe the price is fair.
Not only that, AAA titles in AUS cost around 100 dollars. The lifetime version of this costs half that, and probably gives you more fun than those AAA titles out there. I think 50 dollars for lifetime is justified and fair, but I understand not everyone is going to want to go that far with this game, myself included. The major version will give most people the enjoyment out of this game before they are bored with it.
In short, the different prices are there to suit different peoples interests, and so they can get what there money is worth, rather than paying 100 dollars for a game that they play for 5 hours and never see again.