Although there is no exact date yet, KurtzPel is set to release as an Early Access title in the first quarter of 2019 as an Early Access title.
The price is yet to be revealed, it will be available in form of a single purchase Early Access game. You will not have to buy the game again when it releases fully.
Please visit the game's store page and add it to your wishlist today!
https://store.steampowered.com/app/844870/KurtzPel/