we will need to play from beginning?
Viewing post in October 7th Progress Update! v1.0 Construction begins! comments
In the full release of the game, progress will start from 0 again, yes.
The save system will be changing to have save files. Another big reason for changing is that the game has gone through a lot of balance changes through it's development. Some rewards may be harder or easier to get in the final version. This way everyone has a level playing field.