Look into Bangle.js, it’s what I have, it fits some, not all of your requirements.

It’s open source, both the hardware and the software so no lock ins whatsoever.

They advertise a 2 week battery, mine lasts closer to a month between charges.

You have to install any features you want (every feature is opt in, not opt out).

There’s no speaker, microphone, or keyboard though, so no calling or texting straight from the watch. It’s currently £77 before shipping.

No.

I’ll subscribe

Apng exists

I really love it! It is one of the better city/worker management games out there with a neat unique twist. It has a variety of maps, a few difficulty levels or you can make your own.

Early on I would run into performance issues but the devs have really optimized it so now I can have several hundred beavers running around all with their own tasks and needs.

It will absolutlely allow you to fail and you will know it is your fault and not a roll of the dice. It does not hold your hand but it is fair, and the tech progression is good.