Bungalow planned on existing basement: ideas?

Hello everyone,

we are considering building on an existing basement on a west-facing slope.
The staircase is fixed, and we have planned a bungalow around it.
What do you notice in the floor plan?
Thank you very much for any improvement tips.
Framework conditions:
On the left is south with street/forest. On the right is north/forest. At the top is the west side with a distant view, and the entrance at the bottom is in the east.

Premise: age-appropriate, children's room will later become an office. The office will be planned in the existing basement.

Many thanks!

The area on which the whirlpool stands is basemented and is intended to become a terrace. I hope this allows everything to be derived from our rough plan.

If anyone wants to see the premises for assessment: I have opened another thread regarding the inventory where you can see the surroundings and the overall situation: https://www.hausbau-forum.de/threads/rohbaukeller-Fundament-steht-10-Jahre.33055/

Sorry for the many follow-up comments:
Dimensions Left are 10.9 Right 12.5 contrary to the note on the slip.
Looking forward to your feedback

Where should the child brush their teeth and shower?

Right, that was missing from my notes: A separate shower and a regular sink are planned in the guest bathroom. And if she likes to bathe, she is of course welcome to do so with us.