Overall, the collaboration went well, although it was somewhat prolonged.
Part of the delay was on my side - there were moments that needed correction and the comments were quite valid, while part of it was due to changes in the technical specifications and unclear requirements from the client, as well as inconsistencies in the provided revisions with the company manager.
So, I conclude for the future - when working with companies, clearly agree at the beginning of the work who is responsible for what and which part of the work is approved (company representative, manager, relevant departments).

Clearly defined task. Also, quick revisions allowed to complete the project in the shortest time. Always in touch. Excellent client. I recommend to everyone!

The collaboration was... interesting.
The client has their own vision of technical standards and laws of physics - and actively shares it.
I recommend it to those who love challenges.