Hello! it's 3 dollars for the latest version which will include all the previous ones in the same game.
So you just have to pledge 1 time and the latest download will have the full game for 3 dollars.
When I release future chapter, you will need to have an active subscription to download that chapter.
So you may have to subscribe one more time then which would cost another 3USD.
So you can subscribe and unsubscribe for 3 dollars to play the latest version whenever. Then if you want to play the new chapter a year later, you do the same thing again! :]
When the game is completed I will sell it for more than 3 dollars on here/Steam.