typical question about intended gameplay.

[wiggle_everytime_boop]

Will there be any end game or main plot progression modes in the game?

[ErusTenebrus]

They said there's a story. It's apparent when you start playing that the story is meant to be discovered through exploration - like Subnautica. A story implies that there will be some form of ending, and it seems likely that the game would allow you to continue on once completing it.