If i pay the 10 $ for the0.4.0.5 version. will I then be able to play the game when there comes a new version later or do I have to pay 10 $ every time there comes a new version?
Unfortunately, yes, access to each major version is purchased separately. Currently, purchasing on itch.io is equivalent to a monthly subscription on Patreon/Boosty/Subscribestar and primarily serves to support the developer, as after some time (when the next major patch is released), this version will become public.
We will change this approach to a one-time purchase when we get closer to the release and decide that the game is practically ready.