How to play "Akhet"

About Akhet, from BoardGameGeek:

A hybrid between a tetromino-puzzler and a roll&write, for one to infinitely many players, about agriculture in ancient Egypt. Allot land to the farm workers, invest in irrigation canals and make sure you do not overflood the land while doing so. Leveraging classic roll&write tropes makes this an easy-to-learn but hard-to-master experience that sees you choosing die values to write and draw on your sheet, aiming for a high score. Akhet plays in 30 minutes or less, thanks to the fact that all players act simultaneously.