Agree with you about it being strangely relaxing. It was a game I thought I'd put on for less than a minute and be done with but that wasn't the case as I went through some of the career mode. I like how you can check your progress with each individual object/ part to be cleaned. When I realised it's generous enough about counting something as done (thought you'd have to pixel-hunt the last specks of dirt), it became quite soothing to go back to during the trial period. Won't be buying it right away, but it's definitely one I'll keep in mind whereas without the trial I would never have considered it.
I was excited to do the Santa's Workshop DLC stage. Then when I pressed right on the d-pad to highlight everything to be cleaned and the entire screen lit up...
Very much something to zone out with over a number of sessions.