Programs are only advisory if you can infer a circumstance from them. Otherwise, they do not necessarily show a layperson the difficulties and costs, because they make possible for a layperson what is not feasible or realizable in reality.
Something has already been said about the terms building window and building boundary and the doubt about being able to build over them with the garage. The aerial photo confirms the suspicion that the rear boundary was set to protect the neighboring buildings and garden protection, also because of the height, and that no garage is possible there.
The indicated height limits are partly not comprehensible for the viewer.
Is there an official site plan?
Just as little are the bird’s-eye views without measurements of the house suitable - floor plans would already be advantageous, unless you actually do not want to discuss the floor plan now, but only the location of the house with garage, driveway, etc., but even for that, you would at least need to know the dimensions of the property and those of the house.
When I see your plan created with software, the house as placed is initially possible.
However, the property is only depicted amateurishly (not a negative judgment, but objectively seen). For example, the slope at the top of the plan is not depicted at all. It is not the case that one can simply cut away a slope and then get a level property without further effort. The further measures of excessive earthworks are missing around the property: anchoring, high walls. A small and rather secondary example would be the front driveway, left edge: there are height differences garden/driveway ramp, which come without anchoring. Anchoring and also fall protection (fall protection also at the terrace) belong there, but also an access to be able to walk on the garden area in the basement.
Then the entrance platform: it is not at all possible as a secured platform, you practically fall down the stairs when you go through the front door.
You yourself have noted the slope of the driveway is (too) steep.
Although you do not want a barrier-free driveway with a max. 6% slope, you want to walk on it without problems and without slipping down when wet or snowy. I deliberately exclude the problem with cars, because one first has to ensure that the house is accessible on foot. When that is achieved, then one can take care of the vehicle fleet.
We can now of course deliberate for days in a piecemeal fashion what is allowed, what not, what the development plan says, how the contour lines are to be evaluated and how much or little may be removed, how high the retaining walls may be.
But without facts, we cannot get any further here.
I refer to the GaVo (driveway), state building regulations regarding the 2nd escape route (AHR basement) and your unknown development plan.