3 hours into the game, I must say, the nostalgic feeling of Harvest Moon and Doraemon hits like a truck with this. The tutorial is freaking long, about 35 minutes~45 minutes, but once that is all out, you can start your game. You'll need a lot of gold from the get go... just to buy/upgrade tools, build/upgrade building and all. Really gives off the same Harvest Moon: Friends of Mineral Town feel from Play Station 1 days.

Resource management is certainly a thing here, and Nobita's stamina is portrayed in numbers, and honestly, there's not much actions which can be done within one day. There are tips and tricks to maximize each day's gain, but that would up to the player. After a while, you'll get to use Doraemon's gadgets to help you in your farming, makes life easier.

It's fun for me, but still too early to tell since I'm only a few hours into the game.

Yes, multi save is supported, but if you're save scumming, do be careful not to overwrite your spouse's game.
If you're playing on a Nintendo Switch, maybe you could just have her register her own account so that the save files does not clash?
Core components are still the same, you farm, forage, mine, cook, and also fish. Then you also must upgrade your tools and with each upgrade, your farming and mining life becomes easier. Doraemon tools will come in handy in cases like "Super Gloves", which I just recently acquired allows you to sow the seeds and fertilizer in a wide area rather than tile by tile. There's also the Anywhere Door which allows the user to teleport around the map, but it comes with a catch, the door will only be in entry and exit point of each map. There's other tools which I have yet to find, still in 1st year, Summer 17th.

Also, take note that there is no romance or marriage in this game, it's mostly all just town folk stories and building friendships. Every month also got certain town events where everyone does not work for that day...

Upgrade costs is one hell of a hike per upgrade....