All valid points, however I bought The Room 1 on Steam and played it a couple times, and I imagine the size of certain puzzle elements could seem diminutive on a phone screen.
Current phones have pushed the screen size arms race to the point they’ve gotten very tall, but width has not changed much, being limited by the ability of an average-sized hand to operate the screen while holding the phone. This puts a hard ceiling on the real-life size of the on-screen elements.
Having tried watching YouTube videos, and played landscape-mode games on current phones, I can attest how everything can look positively small even though the phone itself, and its screen, which generally covers ~90% of the front anyway, are anything but small.
This is of course also a consequence of 16:9 frames being painted on screens that are 19:16 or wider. You might get black bars on the sides if the game is designed for 16:9, reducing the effective screen size to one that is smaller than what the phone manufacturer advertises.
I’m not putting much faith in the Play Store rating, also because some seem to have no qualms watching on their phones TV, or worse, films which have been shot for the silverscreen, and that ought to be regarded as some kind of crime 
In conclusion, some games, in particular those which are not mobile centric (like, e.g. The Room), and have not been designed around the current screen proportions, may play better on tablets which have not only larger, but more usable screens, too.
Additionally:
Don’t forget that, with USB C, you are one cable away from connecting a phone to a TV. Now add a gamepad and you’re set.
