Floor plan review single-family house with basement on a slight slope

Hello everyone,
after reading along for a long time and following the occasional thread/comment, I now dare to come out of hiding with our current planning status and hope for brutally constructive feedback. Of course, I have oriented myself along the template from ....

Development plan/Restrictions
Fortunately, we have "access" to a family-owned plot. The old house has to be torn down and we want to build new roughly on the same spot. Setback areas fit on all sides.
Size of the plot: approx. 900m² with a slight slope
Number of parking spaces: (old) double garage is there, initially to remain
Number of floors: II permitted
Roof shape: Gable roof specified, 40-50°
Maximum heights/limits: 3.25 m uphill side, 5.50 m valley side
Requirements of the builders
Basement, floors: with full basement (partly as living space), ground floor, attic
Number of persons: 4 persons (2 adults + 2 small children)
Office: Increasing home office (both)
Overnight guests per year: 2-5 people, 3-10 times a year (if not under Corona)
Open kitchen: yes, with "half" cooking island
Number of dining seats: 6-8
Fireplace: no
Further wishes/special features/daily routine, gladly also reasons why this or that should not be: We have planned a small pantry/storage room because we are used to it and it is very practical. The kitchen is also already largely planned according to our practical needs. Children’s rooms should be the same size because my wife is severely traumatized by always having the smaller room ;-)
House design
Who designed the plan: Originally based on a Kern-Haus, but ultimately freely designed (with kern-haus). We have already slimmed down quite a bit from our originally much larger plans and saved a total of 20 m².
What do you especially like? Why? We already like many things exactly as they are, for example we have the terrace on the "nice" side, which is accessible from the kitchen and dining room. The ground-level exit in the basement uses the slope for offices (or the guest room) with sufficient daylight. We do not need a huge wellness area in the attic; a compact bathroom is enough for us. A dressing room would only be nice-to-have, but we have foregone it and made sure that there is enough space for our large wardrobes.
What do you not like? Why? We are currently quite satisfied.
Price estimate according to architect/planner: 320k € (but we have already included as many things as possible in a preliminary presentation). A finished basement comes with about 50-60k € extra (we are currently waiting for the results of the soil report).
Personal price limit for the house, including equipment: please not too much ;-)
Favored heating technology: Air-water heat pump (Gas would basically be available but is inconveniently located to the house. In addition, a photovoltaic system should supply the heat pump (at least partially) in the long term.)
If you have to do without, which details/expansions
-you can do without: The photovoltaic system is initially out (but the roof and wiring possibilities are prepared for it), central controlled ventilation is too expensive for us, we will probably make concessions on the stair covering and take only the second most expensive and second nicest solid wood covering.
-you cannot do without: Basement, 2nd bathroom on the ground floor
Why did the design turn out the way it is now? We have looked a lot ourselves (catalogs, model house parks, friends and relatives, and our current apartment) and have already worked through several iterations of the plan together with Kern-Haus.
Main living area will probably initially always be the living/dining area, but the kids should later have enough retreat space in their own rooms. Optionally, home office and children’s room could be swapped later.
[I]What makes it particularly good or bad in your eyes? The design covers what we envision, and we currently see no deficiencies.
What is the most important/basic question about the floor plan summarized in 130 characters?
Are we overlooking something important? Any tips regarding the outdoor areas?

We have been somewhat negligent about the outdoor areas so far but have now come into contact with landscaping contractors. The parents-in-law live in house number 31, towards which we are placing the terrace. Alternatively/additionally, there will be another seating area towards the barn (which gets sun in the afternoon/evening), but that will be on the “lower level”. The outdoor unit/fan of the air-water heat pump faces the neighbor with number 35. At the front entrance, 3m to the neighboring plot must be kept free anyway, so you can drive there with the car once in a while (but that is not supposed to be the main parking space).

Draw the planned house into the plot and add a few elevation points.

and have already gone through several iterations of the plan together with Kern-Haus.

Show which ones, with comments on what was changed and why.

The property still needs to be divided and transferred at the notary - but the surveyor has already been there, also to measure the new boundary stones. Unfortunately, I do not yet have the exact elevation points, but I hope that will happen this year.

I would have to partly scan the old versions, but they are outdated anyway. Most of it was simply due to our progressing planning. Kern-Haus actually didn’t give us any specifications, at most they pointed out pros and cons when we were wavering between two variants that we had come up with ourselves or reported from the experience of previous construction projects. The main changes summarized: 1) Our first draft was based on a Kern-Haus from the catalog, where we only changed the children’s rooms (upstairs). Since we planned with a basement from the beginning, but the catalog house had no basement, the utility room was moved to the basement, we added a ground floor bathroom and a pantry, and the hallway was therefore cut a bit differently. 2) We shifted the hallway and staircase a bit again, thereby widening the master bedroom upstairs somewhat (to enlarge the closet niche). This also made the bathroom a bit more compact, which suits us well. The bathroom still had a T-wall (an upside-down T) with the sink in front - toilet behind on the left and shower behind on the right, as in the original Kern-Haus. 3) After the first financing surge and applying the red pencil, we shortened the house by about half a meter, saving almost 20 m² over three floors (3 x 10.6m x 0.6m). The bathroom had to be rearranged again because of this.

Oh dear, the description of the genesis from the catalog model to individual planning reads worrying - even if it doesn't necessarily have to repeat the story of ;-)

Overall a nice floor plan, I think. I would swap the space of the door with the sink in the guest WC, so you don’t always have to go directly through the dirty area behind the entrance door. I would replace the sliding door to the living-dining room with a double-wing, wider (glass) door. The left wing could then be fixed and you use the right one. At least sliding doors annoy me personally, it just takes me too long to close them. I fear the kitchen will be quite dark with the one patio door. So either put an east-facing window between the countertop and tall cabinets (would give morning sun, if nothing is in the way) or more windows to the south. Possibly make the peninsula a bit shorter and move it away from the wall (to make it an island) in order to be able to place a large lift-and-slide door behind it.

Just like I would exceptionally dock the island on the interior wall here or shorten it by half a meter and make at least a 2-meter glass front in SW. Also, widen all the upper floor windows to 2 meters.