when will the game be finished?
The game will be finished when it gets to version 1.0, this doesn't mean it stops there the game can go to version 2.0 but at 1.0 the game must  have an acceptable length of gameplay and all quests finish, and all art in the final state.
at version 0.5 the game will be halfway through finish.

Play only the next major update 
 if you play version 0.22 you shoud probably just play again when it reach out version 0.3 or higher, so you can enjoy alot of more new content and avoid to be saturated of playing for the most part the same thing over and over again.(this is just a sugestion you play as many times you whant lol)