Opinions on the bungalow floor plan

Your comments are not quite what we hoped for. But we take them to heart! We are currently reconsidering the floor plan. It does not necessarily have to be a corner bungalow. It started as a 1.5-storey house with a hipped roof. In the end, however, it simply became too expensive because it turned out that the ground was not so great, and thus the house in that size and specification was no longer feasible. As a result, there are now significantly fewer square meters, but all straight walls.

Visits from the children are even definitely welcome. It's a shame that the floor plan suggests otherwise. We just had the idea that they would either be in the living room or in the playroom. Later, when they are teenagers, one child would move upstairs and for the other we would combine the children's rooms. So in the end, everyone would again have enough space to develop.

In which playroom? There is no room planned for that at all. How old is the current child?

How many square meters of living space do you want to realize approximately now?

One of the two children's rooms is to be a pure playroom. Our little one is now 15 months old.

We now have about 127m² of living space plus garage and storage room

I don't quite understand the point about the angle bungalow. I can't imagine that the bungalow is significantly cheaper than a 1.5-story house, especially if you still want to convert the attic. And honestly, I don't understand the sentence about the not-so-great floor either. So why is the angle bungalow cheaper then?

A living area of 127 m2 can also be well realized with another house type (not that I want to dissuade you from the angle bungalow, but there are so many problems with your design that you should also consider another house form). Just look at the hallways and dressing rooms. I estimate that this accounts for an area of about 30 m² that is wasted only by hallways and dressing rooms, but no one can step in the rooms because of it. Look at all the "niches." What are you supposed to do with a 1m wide niche in the children's room and guest room? That's dead space. In my opinion, you are wasting money in many places that should actually increase the living value.

The 1.5-story house had around 180m², but according to DIN 140m². However, since we built over the double garage, we needed a reinforced concrete ceiling (soundproofing) and the terrace was covered. This resulted in a huge house for the construction companies in terms of calculations, but usable space was quite limited due to the roof shape. Then a soil survey was carried out based on this house. We have to undertake significant earthworks. Now we only have a simple garage, but with a storage room attached at the back and considerably less area. This leads to lower construction costs. Even though the earthworks increased, we are 25,000€ cheaper than with the other option. We didn’t fully understand it either. But that was the offer from the developer. You are absolutely right about the space for the hallway and dressing rooms. That is a lot of paid living space. At the moment, we are quite puzzled after all the suggestions.

Somehow, this is all a bit confusing.
From the way you write, the house you originally planned was completely different from the current one. More living space, a double garage instead of a single, which is also built over, and a covered terrace. Obviously, in this case, the construction costs are higher than now.
But why not just a simple 1.5- or 2-story house, whether with a gable, hip, shed, or tent roof... with the current living space and a simple garage with a storage room? That shouldn’t cost you more.
Is it actually a developer, meaning the land and house are sold together? Or do you already own the land? Then you could also consider going to an architect.