ᐅ Is it acceptable to cover stairs with vinyl flooring like this?

Hello everyone,

We had our concrete staircase covered with glued vinyl flooring by the floor installer.
When he finished, we were a bit shocked by the quality of the work done.
However, he assured me several times that everything was fine. I have attached a few pictures.

Are we being too picky here, or are we right and should he redo it? I would appreciate your opinion.
I am intentionally not mentioning the company name here.

Thank you in advance!

Oh dear... had the apprentice ever used a cartridge gun before?
Just my layman's opinion, but I would also be bothered by that and insist that it be redone.

It looks very poor. If it had been the ten-year-old son, that would be okay, but to pay a company for this work....