Thank you and thanks for trying it out!
Price has not been fully decided.
I haven't considered wandering around after the game is complete, but it's a great idea. For example, if there are things to collect and side quests, perhaps you could still do those after the end.
Hard to say at the moment. The last target date was a bit off due to unforeseen circumstances so I will be communicating the date as I get closer to release and as things settle.
Thanks again!