I am one of these 5% of people, and haven't regretted it since I switched when Win7's support ran out. Unfortunately, I still need to use Windows for work, but since most stuff at work is done in MS Office or browser, it's managable.
If it's true that it used to be a mobile game, then I couldn't tell when I was playing it on steam.
It's a very cute JRPG, no microtransactions, DLCs are entirely cosmetic (and the game still has some customization options in the base game). In general, there's no shady mobile monetization schemes in the game, if that's what you are worried about.
The game is a bit on the easier side after the beginning bit (though you can choose to just not level of you want challenge). The story is pretty cute. Nothing ground breaking, but I had a lot of fun seeing the characters throughout the story.
I am one of these 5% of people, and haven't regretted it since I switched when Win7's support ran out. Unfortunately, I still need to use Windows for work, but since most stuff at work is done in MS Office or browser, it's managable.