Single-family house on a slope with a basement for 2 people including home office and hobby rooms

That is right, because your cooperation is crucial for success. It consists of giving the architect a picture of your life, wishes, dislikes, goals, habits, preferences, needs, etc., and then giving him the freedom for an architecture that fits exactly that. That is division of labor. For example, bouldering does not get just any room; it is considered and implemented in the concept. That is another dimension and not for laymen like us. With a good solution, you immediately move away from the standard and still stay within the budget.

Where is the basement plan? Topic statics: I assume you will also need load-bearing walls, you have only planned 12cm walls. Unfortunately, you won’t make it with 500k for the project. On the slope, you will probably need concrete walls as well. Shell construction with residential basement about 350k-400k, construction site costs 10-15k, air-water heat pump in the range of 30-40k, sanitary 30-40k, electrical (KNX?) from 25k and no upper limit, double garage will also cost you 50k. Then you still have no driveway or courtyard paved and no exterior/garden landscaping. Added to this are the "little things" screed, floor coverings, doors, painting/wallpapering, garage doors, kitchen and furniture, another 70-100k. So then...

I am happy to receive constructive criticism here.

The hallway is dark, the bedroom is a little room where you fall over the bed at the door.

That’s why the dressing room, where you also undress, is behind the bedroom? The flow is totally inconvenient for you then. Have you considered that? You should definitely swap that.

Ground floor, so I find the open-plan room quite okay in layout but it’s also totally dark if north is supposed to be on the right side of the plan.

The house is big, but everywhere just small chambers...

According to the questionnaire, you don’t have that many overnight guests. Do you really need a separate guest room, especially if you plan so many other rooms?

To really get soundproofing from people downstairs, you need a door to this living space.

The study is laid out so that you have to squeeze between the desk and the back wall.

Closed kitchen – why not. The way to the dining area is inconveniently long.

With your design, you’re hitting the budget limits and don’t even implement the requirements into good architecture.

What is wrong with the statics? Then I could still improve that.

Maybe a higher knee wall is possible, too.

But that’s exactly what I’m asking for. Explanations about what exactly doesn’t fit and why and why unrealistic?

But for bouldering you need an enclosed room. Hmm, I'm not so keen on this open design with few walls.